Gateway Offline Error

I am the admin for IamTDR  company.
1. The error is showing in the PBI web interface,  Everything on the gateway server looks fine

2. IamTDR  will need to confirm, but I believe the refresh is scheduled in powerbi somehow.

3. Some reports refresh while others fail within the same timeframe.  

4. The gateway is closed overnight but these refreshes are not occuring during that down time.

5. The gateway is on the latest version

6.  IamTDR will need to provide those

Initially, the MS tech was looking at the network ports test on the gateway where like 6 of the 23 ports were failing for some unknown reason (we do not block outgoing ports on the firewall, and the ports that failed changed on each test).  I disabled HTTPS mode and now all ports are reporting as open.  

My suspicion is that the gateway (or the DB it connects to) is getting overwhelmed at times.  I do see CPU spikes nearing 100% on the gateway while refreshes are running, but I can't find an exact coorelation as it does this when refreshes work as well.  The DB server resources do not seem to be abnormally taxed.