After downloading Big Sur, open programs become repeatedly inactive during use
I recently downloaded Big Sur on my MacBook Air (2018). Now when I'm in the middle of using any program (Safari, Word, Mail, ZOOM, etc.), it becomes "inactive". I don't know how else to describe it. For example, I've been typing this question here in Safari and 12 times so far I've had to re-click in this text box to finish describing my problem. I'll be typing and suddenly the program isn't accepting my typing anymore. The menu bar shows I'm still in that program, but I have to re-click the box/document to continue working. It's annoying and VERY time-consuming. It's only started since downloading Big Sur. I've even slowed my typing down to make sure I'm not hitting another key. I'm not sure if it is an update problem, or something worse! Has anyone else experienced these types of problems? Any help would be appreciated!!
MacBook