Some customers complained that the NanoPi2 cannot boot Debian or Android normally or after an OS loads it will reboot quite often.
We got a fix for this issue. Please check this thread:
viewtopic.php?f=17&t=37&p=85#p85

Sorry for causing these customers this trouble and we really thank all of you who have trusted us and have chosen our NanoPi 2. We cannot say the NanoPi2 is a perfect product but we will do our best to improve it and make it better.