Cut Copy Format greyed out in PowerPoint for Mac

Question

Hi,

I have a very annoying issue that happens in powerpoint. This is running on a mac.

After some time working with any deck, my cut copy format buttons gray out and I can then no longer work with the deck as I did before. I get a "bing" out of my computer telling me I can do actions like delete, or copy/paste. I can't delete slides (or paste) with my keyboard, only by right-clicking on the slide and deleting 1 at a time. The only fix is restarting power point (sometimes the whole computer), for it to go away only for it to come back within a short period.