Stock WM6.1 ROM, Mogul stops responding to keypresses

[us17]

I recently upgraded to the latest stock Sprint ROM on HTC's website and am running into a problem I can't find a solution to. Everything seems to work fine, but after a while the phone will stop responding to keypresses altogether. After the screen turns off from being idle, I can't get it to turn on using the power button. This has happened with the screen on as well, and no other buttons seem to work. My only solution is to soft reset, but I can't be constantly soft resetting my phone to make sure I don't miss calls or anything, and I'd rather not go back to the old ROM. Anyone know what's up?