WG U5000 25" random loss of focus, too bright

After playing some RB:FFS I turned away from the cabinet to do something else. When I looked back, the screen was nearly full-white, almost entirely out of focus, with some barely distinguishable retrace lines visible. After a second or so it flickered back to where it should be. It did it again a bit later. I shut it off at this point.

Does this sound like a failing flyback to everybody else?