I have Xfinity router with 3 xFi pods -I have 4 floodlights cams and couple indoor cameras. The xFi pods are a mesh network and I wouldn’t put the Chime Pro in the mix. That would probably just cause other problems. I would unplug all of your pods, unplug the router then plug in router and then wait 5 minutes, then start plugging back in the pods one at a time in 5 minute increments. I’ve had issues with a pod or two going offline and causing weird problems in the network. restarting eveything fixed the problem for me.
The 2.5/5 Ghz merged network works just fine for me - all of the cameras attach to 2.5 and all of our laptops/computers/tablets attach at 5GHz.
Also, install the xFi mobile app and check out the Networks tab - it shows the status of each pod and the devices attached to it.