Hi Soumya
The problem with the issue is two-fold. 1) it is unstable, and appear from time to time, i.e. not reproducible at _any_ moment. And usually when it happens - it is bad timing to write emails to support or post questions. And no need to say - it is very frustrating. 2) the issue itself: as MANY other people complained - copy/paste does not work occasionally between different applications.
And in my case - I'm using VERY simple paths: copy web-site address from internet explorer into notepad. Or copy plan ascii text (no special chars) from notepad into MS Word, etc. No special formatting involved. Also, at these bad moments - copy/paste is not totally dead. it still works inside notepad, or inside Word. But when I go to diff appl. it looks like that appl. has its own copy/paste buffer, and knows nothing about what I just did try to copy text in other appl.
PS. runnig sfc /scannow does not help. Total reboot - yes, but do total reboot just because copy/paste failed is wrong.