I would recommend looking at this SO post: openssl - bad_record_mac issue on TLS1.2 - Stack Overflow
This is likely a configuration issue on the servers executing the calls, since we don’t have any other customers or developers reporting this issue currently. Typically, if there was an issue with encryption on Zoom’s side, it would be very wide spread. The fact this happens sporadically, leads me to think the SO post above is going to point you in the right direction to solve this issue from your side of things.