Copying and moving bug?

When I try to move or copy any cell Win 10 spins its wheel for a couple of seconds and I then get the message:

"We couldn't free up space on the clipboard. Another program might be using it right now"

I close the message and the action proceeds corectly.

After an hour or so of googling I've still found no solution that works for me. Is there a truly reliable fix to this exasperating bug please? Or at least of isolating the so-called conflicting program, without unreasonable uninstalling?

Although I never encountered it in Excel 2000, it seems to have persisted unfixed by Microsoft for years in more recent versions.

Terry, UK