Guys,

I loaded 4.5 using the directions provided on here. It does work, but only for like 10 minutes. It reboots itself over and over again. It works for awhile and then resets itself. Anyone have any suggestions?

Ricardo

I had troubles with the rebooting loop when using Berry Tunes 2.5. Others have said that using the Viigo program in the 4.5 OS. Hard to know which program might be causing this, or if it's a program conflict at all. Does it go into a loop each time you've done something specific?

Do you have your media card in the Blackberry? Try it with the micro SD card removed.

What model phone do you have... and what version of 4.5 did you load?

Exactly:
Fix for Media Player Not Scanning For Music, Stuck on Scan, or Constant Reboots

This same problem happened to my tmobile 8800 I had to reinstall the 4.2

As posted above already, this is usually caused by the media card.