not recording

I just received a refurbished unit and I'm beginning to regret sending in my original. The refurb has a problem that wasn't there before. I'll take off and have video, get in the air and cannot start recording. If I hit the record button it quickly flashes the screen and then goes back to the...

i was shooting good scenes the week end, but the most complex one, a scene of about 6 min wasnt recorded on my go pro, when downloading the files i got a message of an error from gopro and the scene isnt there. Any idea of what happened? (Btw i have the hole scene on my mobile at low res)