Windows 11 has a problem with copy and paste not working reliably and has for years from searches I have done about how to fix.
Microsoft fix is to restart the computer....
Never mind all your files and programs that are open and the delay in re-opening after a restart.
They never fix issues like this. It was working in prior versions but not Windows 11.
To be honest despite having had PCs running Windows 11 since the day it was released... I had not noticed this problem. Looking this up after you mentioned it. So, I asked the Grok4 AI model in Perplexity.ai. It had a few suggestions that might be somewhat helpful to you.
“The clipboard in Windows 11 can lock up due to conflicts with background applications, such as video players or resource-heavy programs like Adobe software, leading to inconsistent behavior during sessions. System updates, including the 24H2 release, have introduced specific bugs where clipboard history appears blank or stops syncing across devices, exacerbating reliability issues.” I still prefer Windows 10 on my primary laptop so that is probably why I had not noticed. More info here:
https://www.perplexity.ai/search/windows-11-has-a-problem-with-dygLG4TBTPOa10K3wszOUw#0