Same Issue on Tab S7+ 5G. Samsung Support has no solution. It's a shame...
You are not alone, and I am glad to know that neither am I. Right after the update, the tablet started to randomly freeze for several seconds, on multiple applications, and the screen is unresponsive as you say. Quite disappointed that it happens with such a product and also hope that it will be fixed because it is indeed a pain.
it seems like it's actually getting worse and samsung doesn't care. Every few minutes my screen becomes unresponsive. doesn't matter what app I'm in. It even galena when the tablet is locked. Tapping the screen several times does nothing and hitting the power always works.
My S7+ started doing this with the last update as well. It will pause for 2-5 seconds at a time every minute or so. It's really destroyed the usability of the tablet. When it freezes up, animations/videos seem to keep playing but no input is processed at all.
When I turned on the developer option to show touches even they don't get registered while it's locked up. But the animated gifs keep playing (I see this mostly in Google News and Chrome since that's the only time I'm actively scrolling/working) It doesn't seem to effect video playback.
I haven't bothered trying to contact Samsung not sure it would matter if I did. I don't see any way of rolling back the update either.
Just installed the October security update this morning and "freezing / stuttering" seems to be fixed