I'm currently running the 9-15-12 update of XenonHD with LeanKernel. If I use the reboot feature on the power menu it takes a good amount of time to reboot. It stays at the Google Splash Screen. Sometimes I have had to do a battery pull and then it will come back up after 3 or 4 minutes. It started a week ago when I was trying out a version of MIUI. Any help is greatly appreciated.