I tried again today, first I installed the "GPS Test" App to see if the Nexus 7 is actually losing the internal GPS signal, or the iFly program cannot see the GPS. Had the same results with IFly, the GPS will work for a few minutes and then it will get the "No GPS Position Lock" red banner, the Fix Quality will show no signal, and no more screen refresh (program is still working). I switched real quick to GPS Test, and it showed rock solid GPS signal with several satellites in sight. I took pictures of both screen. I flew for half an hour looking at output of GPS Test and it never loss the signal. I am going to reinstall the IFly program and maybe perform a factory reset. Next step will be to use an external GPS. Will let you know
Thanks