I have used the following method about 9 times, and it has always worked to get rid of the jerky or "stuttering" video:

1. Press Swap.
2. PIP 3 times to have side by side PIP.
3. Press Swap again to have original channel the active one.
4. Press PIP one more time for full size video.

If you skip step #1, sometimes it works, but not always. I have found that swapping it first always works.

And no, for some reason, if you just swap and then PIP to the first small screen and then Swap back and press PIP 2 times for full video, that won't always work either.

Somehow, side by side--after swapping--seems to be the key that always works.

I don't know what to tell you folks who are in Dual mode. Does this problem even occur in Dual mode?