Adnan wrote@Truepeace I have the same interference problem with the elevator. Can you tell me what you did exactly with your electrician? Did you drastically change the cable path from the phone box to your apartment or just used a shielded cable along the same way as the previous cable?
Sorry for the late reply, I got busy for a while.
The phone cables and electricity cables were in the same tube that is distributing the phone and electricity to the whole building. So I think that the electrician used a different tube for the phone line plus he replaced it with a CAT6 shielded cable (that's what he said) and now I have almost no CRC errors in the downstream but a few remained in the upstream since the SNR of the upstream is relatively low compared to the downstream (13 dB up vs 21 dB down) which annoyed me a little but my main issue was fixed, when the elevator is used no CRC errors appear and the connection never cuts anymore.