Thanks for confirming.
There is a possible underlying hardware problem,
but you are about the 20th person I've talked to today with this same samsung series that is having the same issue, and all were coming up after a recent software update this morning. All signs at this point would indicate a defective firmware version.
Myself and several other techs have made samsung aware of the issue and they are working on a patch for it.
Because it is a significant issue and affecting so many, I would expect this to be an immediate release, meaning within the next few days at most.
You can try unplugging the tv for a few minutes then back on to let it auto update,
and beyond that we just need to wait a few days for the next update to release.
If you find the problem continues beyond that, meaning it is not software related, then I can review some other hardware options with you.