You don't say what kind of internet connection you have, but most likely it's due to extra noise on the line. Home phones ring because they send ~100 volts AC down the line.
I've worked on allot of pots lines and haven't done that in 20 years as its all fiber back-hauld now.
The only time I'd send power down a copper line is to fuse it back together so I didn't have to dig it up and replace it and that's super rare now as I'd just put in a order to have it replaced with a 12 pair fiber run.
The only time I'd send power down a copper line is to fuse it back together so I didn't have to dig it up and replace it and that's super rare now as I'd just put in a order to have it replaced with a 12 pair fiber run.