[Q] Fast and constant reboot

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http://forum.xda-developers.com – My pocket felt hot, so I pulled out my phone and saw that it kept rebooting itself. It just shows the initial Samsung splash for maybe a second or two, then loops again. I can get into Recovery and Download modes fine. I tried wiping the cache, factory reset, restoring a cwm backup. No luck so far. I've been using the CM9 rom for months. I haven't flashed or changed anything in months, I haven't even installed new apps in a while. Before this happened, it said I had no signal, so I had to restore my EFS(which I've had to do several times since I got the phone, mostly when I was switchin (HowTos)