I'd like to change my vote from No to Yes.

I haven't really seen it, but it happened to me today. Only once, though, and then it was gone. So no biggie, but I'm technically affected, so, for the record, was 109-13, it's now 110-12.

Also, mine didn't look like Simpu's shot, my screen only moved for a little, and then fixed itself after some maybe 300 ms. Given the fact that my phone is always-portrait, the flipping might have masked it thus far.

Also, it happens with high uptime or high system load. Fresh booted OS is fine.