Thank you Mary for your quick response.
I first discovered the problem in November or December. I thought it was the Xfinity app becasue I did not notice on other streamng apps. However I was on the Ballys app and the excact problem was present. I had been pushing Xfinity for a solution since on their Community Forum people were complaining to them.
The problem is not with one or two channels it can happen at any time.
I have six Roku remotes, ranging form the basic to the Pro. All TV's have the same experience.
Problem started last fall and for a while it was quite less often then resumed to be a major problem again.
Treatments consisted of complaining to Xfinity, changing Roku's from one TV to another, watching other streaming apps, reseting my router (numerous times), unplugging my LG Soundbar for two weeks - problem still there,
Hope you can help me and others