That was a thought from someone I spoke to about the problem but here's the thing: it's on all TVs, all remotes are on RF and it doesn't matter how long the TV has been on. It still happens if the TV has been on for hours, so there must be some other explanation.
There was an earlier request for what my receivers are. They are 2 HR21/100s, a D12/100, and a H24/100.
Thanks for the help.
Mark