All sites have been reset and the IPLA was replaced with a IPLB at the Corporate location. Once the routes were removed from the SonicWall and moved to the new Palo Alto, that is when all hell broke loose. I think that's more than just a coincidence.

This customer has all different carriers ranging from AT&T Fiber, Comcast Fiber, Comcast Coax, Verizon FiOS, never an issue. The Corporate site is on Comcast fiber 500/500, def not a bandwidth issue. Testing between sites show no signs of latency that would cause any problems. The site we have been testing with also has Comcast fiber but their pipe is only 50/50 as they only have 8 users. They also changed the firewall

There was a SonicWall in place that handled all the IPSEC tunneling in the past, since moving the routes over to the new Palo Alto the problem has reared its head. We are moving one remote site back to the SonicWall for testing. I will followup once this is completed.