Sorry if I wasn’t clear , we didn’t switch ISP, we switched from Cable to Fibre. The Internet would regularly slow down to 1 mb or less, devices would then report no internet. I think my family thought that the device were disconnecting from Wifi but it was probably showing disconnecting from Internet. The router would still show connected. It would be useful to have access to some basic tools from the PCWRT interface (speedtest, ping).
After a lot of troubleshooting including 2 hours today and a couple of factory reset of the ADTRAN, Bell is sending one of their technicians as they finally accepted that the issue isn’t my equipment.