High latency/dropped packets on Mitel circuit in LA

I'm having some pretty bad connection issues with one of my remote offices in LA. I figured it was probably wind-related last week but it's still going on today. The vendor (Mitel) is saying that they're testing the circuit as good to the router, but I doubt it because I'm seeing the same missed pings on both the outside and inside interfaces from here (Richmond, VA) across the MPLS network. I know it's possible that it could be the router, but my gut tells me it's a circuit issue. Does anybody know of anything going on out there? Thanks, Paul