Except win10, can other clients still work properly? How your win10 connect to TL-WPA281, wired or wirelessly? If it's wireless connection, have you tried forgetting the profile and reconnet it?

Thanks for your reply. In the meantime I did some more testing and found that the same problem happens with all three of my Win10 devices (desktop PC, laptop, notebook) and indeed my Android phone. I also tried a wired connection, but the problem persists. Forgetting the profile and reconnecting sounds worth trying, but how do I do it?