I have been running into the same problem for many times since I update the Layout from 2020 to 2021.
The problem is that the program does not respond to any click or typing and also it seems really weird.
Because even the task manager does not recognise the LO is not working. Usually when LO is dead, task manager tell me it is not responding. But at this case task manager tell me LO seems working.
And eventually then I have to force quit the program.
Does anyone have the same problem?
So far I had this happening more than 10 times. It is so annoying and seems that nobody talked about this in this community yet.