Hi Fred and Steve,
My Songbook+ related testings show the same result as Fred's experience.
Reliability of Songbook+ connections:
1. Wired USB connection - reliable
2. Bluetooth wireless connection through Yamaha MD-BT01 Bluetooth MIDI adapter via Genos MIDI input/output ports B - reliable
3. WiFi connection - unreliable through both Infrastructure mode, and Access Point mode.
I speculate that this may potentially be a software bug on Genos since WiFi the Access Point mode should be reliable considering how close the iPad/iPad Pro is to the Genos.
Thanks,
Paul