pCloud seems to have been having a few wobbles in the past few months, and it's unclear to me whether the root cause is external or internal. Two different Windows machines both needed manual removal and reinstallation, and the Mac installation needed manually updating to a later version due to (apparently) an SSL certificate renewal. FWIW the current version on my Mac (on Sequoia) seems solid outside of rarely needing to select 'Enable Drive' from the menu.