I'm the "support" guy 😉 Actually, just a field TSA (SE) pitching in where possible to get folks back up and running. Anyway, in this case due to a prior support case firmware was statically set or pinned we call it. For whatever reason it was only pinned on one of the two MX's in the HA pair. That's no good and the HA pair was seeing lots of VRRP transitions and dual master situations. @IllinoisCollege to your point about load on the MX that is something I noticed and might be an issue. You look to be at the upper limit of clients we recommend on a MX450. You might want to engage Support again as they can see more info than I can with regards to flow counts etc that would show the true load on the MX.
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