Clipboard has been unstable on every OS (especially on Desktop - and I mean Linux, Windows and Mac), and I think part of the culprit is apps like Teams and Discord, if you Ctrl + C by mistake on an empty text box, IT COPIES THE EMPTY TEXT BOX effectively wiping your clipboard. It's the most irritating UX and it took me years to figure out. Always right click copy and right click paste, you'll notice it works 100% of the time as it used to.