Server side bug with lemmy.world and intermitent authentication.
I am currently getting signed out every minute from lemmy.world. This is not a client side cache issue. I tested making API calls from the command line (with curl) with no cache and the issue still occurs. One call I get the correct response, the next I get a 400 telling me im not signed in.
The issue is server sided so it will not matter what you use unfortunately. Technically a temp but terrible fix is to keep retrying on 400s (not signed in) until a 200 (success) is returned. This is terrible because you pretty much never want to retry for 400 errors because 400 errors are client side errors (except in this case).