Updated last night and flew a test flight this evening under 3.1.2, just to make sure.
It did say they was a "firmware out of sync" and I let it update that too.
Wouldn't start after that, but a simple shut down and restart of the copter, the Remote and the DJIGo app produced a good flying platform again.
So, just make sure to restart everything AFTER the update and it looks good to go.
No glitches from this side.
AD (P4, App 3.1.2, Aircraft 1.02.0602, Remote 1.8.0)