RMPP screen not responsive after upgrading to 3.15

Just posting my experience here in case anyone encounters the same issue as 3.15 is out now.

My RMPP was upgraded to 3.15 automatically while it was in sleep(?). The next time when I tried to turn it on from sleep, the touch screen was not working and I was not able to enter the passcode.

It was back to normal after a few long presses of the top button. I don't recall how many times I pressed or how many seconds I pressed though. I just kept pressing. There was a while the screen started blinking during the long presses.

Edit: Integration is also gone in the device. It's still there on the webpage, not sure how to get it back.

Edit: sync is also gone. All are back to normal after rolling back to 3.14 with software recovery (restore data).