Smart check error maxtransit dual

New setup of Maxtransit dual modem cat12. ATT on modem 1 and Verizon modem 2. Also WiFi as WAN with M2000 TMobile. Getting a smartcheck error on modem 1. Using google dns, tried suggestions for changing intervals and using dns vs smartcheck, but nothing worked, so I had to disable completely. Would like help resolving this- seems like a configuration issue?