Dealing with K82632320: Error message: err tcl_monitor: PID: * (_check_memory_above_limit): worker exceeded memory buffer limit 10 initial memory size * current memory size *

Like what the article K82632320 suggested, the IMAP monitor worker restarts and the system logs a message. You might want to open a support case with F5 Support to see if this same behavior applies to POP3 or if its something else.