TV screen goes blank or flashes a white screen

During playback of movies or TV shows, the TV screen will go blank or it will flash a white fuzzy screen and then the picture will come back.  The audio continues uninterrupted.  We have reset the unit several times, I bought a new HDMI cable just in case that was the issue and still have the problem.
Another item we have noticed (and it could be related) if you got to video settings, we have the resolution set to 1080p.  But from time to time the setting reverts back to 720p.

..... Except, the Apple TV still won't change to the 1080p.
It's likely not as bad as you think, if your tv is 1080 then that's what you will be watching whether you have your tv set to upscale the picture to 1080 or whether the tv outputs at 720 and lets the tv upscale to 1080.
The worst scenario for you would be if the tv wasn't as good at upscaling as the tv. This largely depends on how good your tv is.
For example. We have a 50" LG tv in the front room, which is a little wacky since its display is actually something like 1366 x 768, so no matter what resolution we set the tv at the tv will always do some scaling. However it was noted that the tv is actually very good at scaling, indeed it's better than the tv (probably due to it costing c£ 3,000). So if we have a SD file, we get a better picture when the tv outputs at SD than when it outputs at 720, however we can't keep shifting resolutions to match our content so the tv is set at 720 (if it wasn't we would lose much of the quality when we play >SD content.
On the other hand our tv in the bedroom is a 46" Sharp Aquios and its upscaling is lousy. It's so poor that if we watch a SD tv broadcast (upscaled by tv to 1080) live and compare it to a recording of the same broadcast and played through the tv (output at 1080) the recording is noticeably better than the original broadcast.
I guess what I'm trying to say is that it all depends on your equipment.

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