I have a 1 Gbps connection with an ISP that rents another telecommunications company’s fiber. That telecom owns the ONT in my apartment.

I had an electrician fix the heated floor in my bathroom a few weeks ago. He had to turn off the main breaker for safety reasons, which also cut power to the ONT. After turning the power back on, my speeds had dropped from 1 Gbps to circa 100 Mbps. I filed a ticket with my ISP, who resolved the issue by having the telecom do something at their end, they said. (Sounds software-y/configuration-y.)

Yesterday, I f*cked my router (a raspberry pi with openwrt) up by flashing the latest pre-release firmware on it. I lost all connections and the Pi wouldn’t recognize any of its hardware interfaces. As part or my “routine”, I rebooted my devices in this order: my APs, my routers and, lastly, my ONT. After some diagnosing, I identified that the problem was indeed the new firmware on the router/Pi. But then I noticed that my speeds had dropped, so I gauged the speeds directly at the ONT and, lo and behold, they were down to 100 Mbps again. I have, yet again, filed a ticked with my ISP, waiting to hear from them now.

My question, just out of curiosity, to those of you that have the knowledge/experience: what could be going on the telecom’s end? Is there a correlation/plausible technical explanation between my connection speeds dropping and restarting or cutting the power to the ONT?