Having some weird behavior I hope someone will know about.I have an APM 2 on a quad that has been working fine. Took it out today and it won't initialize. Te board just sits with the amber LED flickering. If I plug in the USB cable from the PC, the bore comes up. If I power it from the battery, it does the flickering amber LED. I power the board from a 5 volt BEC normally. I assumed it was a bad BEC, but when I checked it, it is putting out clean 5V. I tried putting on the jumper and powering the board from the ESCs, but get the same thing. It only wants to work when the USB is plugged in.Any ideas?