Well assuming I'm not failing a super saiyan sarcasm roll..
Soloing it shouldn't be happening for many then.
Unless it's bogging the entire server hosting instances with monks, which would be pretty danged easy to test, they'd just have to disable the monk class for a day and see if the problem persists, gets worse, or gets better.
Another consideration oft overlooked is the whole per account grade server prioritization. We all seem to forget about that or assume it's only affecting login during heavy login dense periods like just after downtime or patches.
Wouldn't it be interesting if the server when under extreme load dropped or stopped responding to f2p first, then premium, and if it ran out of them without load improvement moved on to vip.
Traffic prioritization by account class. Hmm.