screen flicker to window and back

[tonykriegmaui]

The screen flicks every 20 seconds or so for a second or less on Macbook Air M1.The screen moves to the left and shows what appears to be a blank email but it happens so fast I can't try to click on it. This happens on any app that I am using (Word, Chrome email etc). If all programs are closed and I am at the desktop it flickers but more like a brief flash with no email window. Any thoughts is this a hardware or software (Big Sur) issue

 

[tonykriegmaui]

I think we've solved it. At some point this morning a pop up window which said something like the computer couldn't connect to a yahoo server. Once I clicked on the "move on" choice it did keep flickering. I then logged into the yahoo email site and then shut down and restarted the M1 seems that that the flickering has stopped