So I just bought a hero 4 silver used and I got the Sandisk extreme 32gb memory card and I recorded about 2 clips with it (on a fully charged battery)before setting it down for a bit. Went to try and turn it on an hour later and when I tried to turn it on, nothing but the hero logo popped up on the front screen and nothing else. It won't let me restart it or anything. And it won't even show that it is charging when I plug it in. AND it takes about 30 seconds before the hero logo eventually pops up too. Any ideas on what it could be?