I just wanted to say that I've never had a problem with the program auto locking on me, but after the latest update, mine is starting to do it now.
Luckily my screen will go half dim before it locks, so I can quickly touch the screen and bring it back before the lock out, but it's kind of annoying because it never did this before.
App Version: 4.0.9
iOS: 8.1.1
Device: iPad4,1
Upgrades: sync, midi, documents
Is it possible that the iOS is somehow overriding the programming to keep the device on constantly?