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SDWan Disconnect when ISP in third site has issues

We are encountering an issue with our SD-Wan. The SD-WAN is created via a Sophos Central SD-Wan Connection group.

For sake of this question we have 3 sites,  (Site A = Head office where AD/DNS and RemoteApp server are at; Site B where affected user is at; Site C where ISP issue is happening).

We began having some issues with one of the ISP services in Site C over last weekend. There are two ISP at both Site B and C.  What seems to happen is when one of Site C's ISP has an issue and the SD-WAN determines that that path is not accessible connections between Site A and B are impacted.  We've primarily had user reports of this impacting a Remote App service that is hosted in Site A.  Though I believe it affected my SSH session during testing yesterday.

We've been able to reproduce this and it for the affected users in question, this becomes more than a nuisance as the application being delivered via Remote App can become non-responsive if this happens during some actions (we haven't figure out exactly which).  I also experienced this when just RDP'd into a server in Site A from Site B.

Unless something is going screwy with the routing there should be no dependencies on Site C for this Remote App.

I've opened a support case, but so far haven't gotten anywhere with that. I was wondering if anyone here has seen something similar.

The involved firewalls are all running SFOS 19.0.0 GA-Build317) 
Site A is an SFV4C6 
Site B is an XGS2300
Site C is an XGS126.

For the case of a picture being worth a thousand words.



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