PTCL DSL router frequent disconnection

So 4-5 months ago there was this frequent disconnect problem on every device that was connected to the PTCL router. But after some while it automatically stopped disconnecting and started working fine.
But now again since 1-2 weeks it has started disconnecting again and again and I can’t really find where exactly is the problem. Nothing is changed. Same wires, cable, router etc.

Please tell me what exactly can be the problem?

Here are the SNR and Line attenuation values.