I have one user that had this reboot cycle start on their Blackberry 8530 (This was working fine for months
) we replaced this phone and the new one started the reboot cycle immediately after BES activation
. Things I have done so far is reseting the device to factory to get it out of the reboot cycle, made sure it was updated with the latest OS, and manually turned on "Memory Cleaning" (Did not cause any reboot loop) Next step to activate BES and see if it happens again. I think this is an issue with software not hardware, but thats just my opinion.
After the factory reset, updating the OS and manually turning on "Memory cleaning" (I pulled battery afterwards to reboot phone) this device appears to have activated on the BES without the reboot loop issue, I will be pulling the battery out in a few hours to perform another hard reboot to make sure that it is resolved but only time will really tell. Best of luck to everyone else with this issue.