unsolicited advice for

CM

Not being familiar with the setup here, but just an experienced guess, there are multiple DB servers feeding multiple webservers. I have seen clock skew between the db backend and webserver front ends do all kinds of weird and wacky things, none of them really helping what is served. As the connections round-robin, depending on which good/non-good clock systems are connecting, sometimes things look fine, and other times, not so much.

just a thought, double check that ALL the servers are synced to the same sub-millisecond time source.