Apparently, this has nothing to do with the Dell Dock.
I have removed all peripherals, rebooted. And the problem is solved!
– mr LJun 02 '20 at 10:29
Could you please expand your comment to an answer (e.g. how to remove all peripherals, which command(s), if any, to run etc.) and post to this question to help future readers. Thanks.
– pomskyJun 02 '20 at 10:34