2 out of 2 success rate so far!

1. Backup your SD Micro memory card to a folder on your computer
2. On the copy on your computer, delete all "BBThumbs.dat" files in all folders
3. In your BlackBerry, REFORMAT your SD Micro Memory card.
4. Copy your memory card contents from your computer back to the SD Micro memory card.

If you've got internal memory, do the same for your 1 gigabyte of internal device memory. Although that really can't be reformatted, you should be able to least delete the BBThumbs.dat files in this 'memory' too by accessing this in Mass Storage mode. Alternatively, you can temporarily set aside the memory card and use a different SD Micro card and reformat it.

I suspect RIM must have improved their filesystem scanner speed, and there's some stability bug in the filesystem scanner (and the .dat files appear to be some kind of fast thumbnail-index files on the memory card). It has happened before in varions versions of OS 4.6 likely because some optimized-performance thumbnails reader crashes when reading corrupted BBThumbs.dat files.

Besides, starting afresh actually improves the thumbnails performance after the initial lengthy scan. Also, your BlackBerry may be slow for a few minutes while the scanner is regenerating the BBThumbs.dat files in the background. But then you'll have a fast and stable BlackBerry afterwards.

Anyway, it seems to stabilize at least one cause of 5.0.0.314 random reboots.

it worked!!

my device keep rebooting every 30 min!! when i apply this method it's working fine

Thanks

I just had to reformat my media card. thanks.

Update... I realized you can also reformat the internal memory too, in the new "Memory" screen of BlackBerry. So both the internal memory and the memory card can be reformatted. Reformat seems to work better than just using Mass Storage and deleting the BBThumbs.dat files directly.

Also, a clean install is also a safer bet (device wipe and install 5.0.0.314) as it solves other, different, possible causes of crash/reboots.

Just making sure all bases are covered, because 5.0.0.314 is really a good BlackBerryOS, and fire-breathingly fast when properly installed (about 2x to 5x faster than 4.6.0.230-4.6.0.260 range in my experience, including BlackBerry Browser, to things like application launching speed, etc.) It is almost as if RIM replaced the OS JVM, or did some mondo performance profiling & optimizing, or something.

Worked for me!

now if only this version.. was official !

I am experiencing issues with alarm clock not working. It would freeze when I go under menu> set alarm. I can manage to go back to other apps and after about 10 mins, it would then give me a unexpected exception message. Anyone else having this issue?

My alarm works fine.
Do you have any 3rd party apps that hook into the alarm or calendar? Try disabling those temporarily. A clean OS install may also help too.

Thaks for your suggest, i will do that (also i though bout this same).


i made today test with Benchmark magic on 5.0.0.314 and it shows

from:
graphics: 35.7 poly/s
CPU: 1325322 ops/s
Speed Index: 1361.0

to:
graphics: 35.7 poly/s
CPU: 1410743 ops/s
Speed Index: 1446.4


My buddy which returns to OS 4.6 has:

graphics: 14.7 poly/s
CPU: 975925 ops/s
Speed Index: 990.6

Different is huge!

Are you saying that your "from" results are using OS 5.0.0.238 and your "to" results are using OS 5.0.0.314?

Nope, im saying that my "from" & "to" results are using 5.0.0.314, i dont check on 5.0.0.238 But comparing to the OS 4.6 diffrrent is big. Beside OS *314 is much faster that *238, browser is better and loads pages faster, browsing pictures is more faster.

My bold still reboots...

Wirelessly posted

Mine too. Wiped. Reformated and still going crazy

How often are the reboots?

Secondly, you've already heard this, but you are using software that is not official, and by installing said software on your device, you take all the problems and risks that come with it.

Great.. after I read this post my Bold starts rebooting itself.. will have to try this fix now.

I've only had a couple of reboots but I will try this method. Thanks!

After do that, i noticed one restart.

Same as above. Has not restarted till this morning.. Will monitor it.

Following the instructions didn't work until I did a battery pull.. so far it's been staying on for about an hour..

Randomly rebooted twice since my last post.. I think i might revert back to 4.6 if this keeps up.

reset 3 times in 30mins. was ok the first 24hrs...

For those that had it reboot.. were you guys charging the phone? For some reason when I stopped charging the phone via USB or the adapter, the reboots have stopped.

my phone will reboot right after it starts to search for service. unless i am in 3G coverage. if im in EDGE it will just reboot over and over

Mine started rebooting again just after I installed the apps world and reinstall facebook.

Phone still reboots.. It's not that much of a nuisance.. I mean it only takes like what, 40 seconds to boot back up? And it never happens during calls or anything so w.e

Used the method in OP and I haven't had a single random reboot. Hope it stays that way.

Wirelessly posted

This OS will reboot on its own or while you are doing something, and I have no doubt that it will also reboot itself during a phone call. Bear that in mind.

I am going to downgrade to a previous version of the 5.0 9000 OS. If the reboots happened once a day, I would be able to tolerate them, but now they are occuring every five minutes are so, even after a battery pull. The trouble is not worth it.

actually i did the downgrading already..


this beta is not stable as .238 i followed the steps deleting the files formatting the memory card & the device pulled the battery and it was ok for 2 days then back to rebooting


waiting for the official OS 5

I went to downgrade from this OS, while it was doing its rebooting deal, and my Blackberry began not being recognized by my PC. Took about an hour to get it to recognize it. Thought about downgrading to .238 but still having problems so I am going to go to the official AT&T Device OS and hope my device is not messed up. It's hanging on the device restart and everything now.

Yes it reboots when charging.

Yup...that also seems to be the only time my phone reboots as well. I have it plugged in when I'm in my truck and have it paired to my stereo. Once I unplug it, it works fine.

Think we found the bug. Let's hope RIM finds it too.

I ended up reformatting my card entirely, after removing the bbthumbs didn't work. Also switched back from extended to regular battery in case contacts were loose. I have been using a USB charger? Are some saying that if the cradle is used that is not an issue? Why would that be?

I don't have a cradle charger for my bold so I'm not sure. But my Bold has stopped resetting after I stopped charging it with my AC Adapter and my USB cable.

However it's been almost 3 days now and I had to charge my phone via USB and Adapter (depending on where I am) and my reset issue has completely disappeared..

Yeah...it's the car charger that's causing the re-boots.

At first I thought it was my wifi, so I turned that off. Still rebooted. Tried your suggestion about the memory card. No avail. So I removed the card entirely. Charging cradle/cable made no difference. Wiped the device, and started fresh with no third party apps, still resets. I tried everything I could think of. As far as I could tell, it was totally random. The only time it didn't reset, was when I had a bluetooth headset paired to it. Ended up going back to .238 for now.

I too am beginning to think its charger related. 2 reboots today, both while a charger was attached.

I think it's both charger (power management) and wireless related. When i mean wireless i mean like wifi and bluetooth. I discovered too that charging when on my cradle or plugged in my car charger, it'll reboot. Also, when turning on/off wifi and BT, it usually, once in a while reboot itself.

Im not sure if the reformat helps, it may be some sort of stop gap or temporary solution, but not an overall or permanent one, that's for sure.

Something new

Each time I send a sms it reboots

I can charge with USB with no problems.