Session expiration for login in WHM and webmail

Hello A bunch of our cPanel servers (8-10 servers) have trouble logging into WHM and webmail (port 2096) The issue started with cPanel being completely unresponsive on port 2096 for webmail. I tried updating via /scripts/upcp --force and it fixed the issue for a while but now we have session expiration error while logging into WHM or webmail. I'm puzzled as to what's going on because it's not just one server. All servers are running on cPanel v90.0.10 on CloudLinux 7.8 or CentOS 7.8. Is anyone else having this issue? Is this a cPanel problem or something fishy is going on our servers?