I regularly get a bad picture in the 5K+, with a black bar in the middle, and wrong colors below and above this bar, plus eyes desynchronized (always the same problem, see picture on the PI default picture). This can happen after a PC reboot, when Steam VR or Pitool is launched, quite anytime randomly (but never during a game session).
The only way to get out of this (apart from power off of course) is to launch a HMD reset in Pitool. Quite annoying. Anyone with this problem too?