Try a different patch lead, patch port, switch port etc. You could also try manually setting the speed at 100Mbps and see if it stays stable on that speed. ... View more

If the MPLS is your primary then it is expected behavior for the MX to try and attempt to form a tunnel over it. I don't believe there will be an option  to disable autoVPN tunnel over a Primary uplink.    You can enable Active-Active to have a "quicker" failover behavior but I'd start with the KB I previously linked 🙂  ... View more

I'll give that a try, thanks! ... View more