I'm on an HTC Evo 4G rooted running CyanogenMod7 with Tiamat kernel and Clockwork mod. I went to sleep last night and everything was working fine, when I woke up this morning, I rolled over and my phone was stuck in a boot loop. I flashed back to my only backup (UltimateDroid w/Tiamat) and it did the same thing. I flashed to stock ROM and still no luck. I unrooted it and loaded an RUU, so I was able to go back to Sprint and they're replacing it free of charge. But I want to know what caused this so I can avoid it happening again. The only thing that I can think of is the kernel, could that cause something like this?