mine SGS2 E4GT started doing this about 2 weeks ago. it just reboots over & over. i never listen to music. i did change batteries and i wonder if that's why. i'm on my 2nd spare battery & it started happening 2-3 days after i put it in.
i'm not rooted. it doesn't even stay on long enough to do anything
So far, wifi does seem to be the culprit.this is the first time in, maybe,14 hours that I've logged on. unfortunately, I contaminated the experiment--I added another variable. I also uninstalled gtasks, which was also causing problems. So I don't know whether the FC's were caused by low wifi signal or gtasks.
So now, I need to figure out why I get a weaker wifi signal with the standard Samsung Kies ICS 4.0.3 upgrade, and why my S2 runs much hotter since the upgrade. (Working harder?)
Removing the SDHC card helped me too. But the apps on my card weren't corrupted. However, by removing the card,I was able to uninstall all of the apps that FCEd and caused my Galaxy S2 to continually reboot. Returned the card to its slot and the reboots occurred much more rarely.
FWIW, in my case, low wireless signal is no longer (or never was) the cause cause of the reboots. everything became stable the minute after I uninstalled gtasks. I suspect that in a lot of these recurring reboots, the cause is a wayward app or two. In my case,I had trouble believing that the apps were incompatible because they had all been updated to ICS.