On an SD-WAN Edge, traffic traversing the underlay of a routed interface may be limited to 100Mbps, and underlay traffic in excess of that will be dropped.
This may be observed as packet loss or slow to no connectivity for some applications, or a bandwidth test on a client showing about 100Mbps.
When a routed interface is configured as a WAN link (Enable WAN Link option), and has Underlay Accounting enabled, underlay traffic is restricted to 100Mbps, anything in excess gets dropped by the Link Scheduler (lsch_enq_drop). Underlay accounting is only needed if you wish to have this restriction on underlay traffic, in order to prevent underlay traffic from using too much bandwidth on a link that also has a WAN overlay.
Uncheck the "Underlay Accounting" option on the interface configuration.
Disabling "Underlay Accounting" does not cause a service restart.