Kbin does log me out once or twice weekly for no known reason, but I have no difficulties logging in again. You say you’ve cleared site data — cache and cookie? If you’ve tried it twice and it hasn’t worked, time to open a ticket with the help desk (admins).
That does sound frustrating. Wish I had some good advice to offer.
Have you tried a different browser? I’m on Firefox, but some sites don’t play nice with it and I switch to Chrome for a few minutes…
@Bipta