Freezing Trados Studio 2021 with high CPU load

There are several reports about a freeze of Trados Studio with high CPU load in previous versions. I have never noticed this there. Now I have the new version 2021 and it happens again and again. It's the same circumstances as described several times and it happens when confirming a segment. SDL should not blame virus scanner / spell checker / online resources for the error, because the previous version 2019 worked without problems and still does.