This is consistent behaviour:
After taking a short break MGP goes dim. On returning to my iPads, I tap the screen, MGP lights up, but when I tap a button, it goes into scanning mode. It then presents wifi only (never USB) I tap it, and get the ‘Connecting…’ pop up, which always results in ‘Connection Failed’. So I must quit MGP and re launch it. If it does in fact reconnect, there is no MIDI getting through to my PC. So I must relaunch MGP anyway.
MGP 1.7.3
Metaserver 6.0.3