Router just says stuff like:

16.11.2017 20:22:28 WAN connected, WAN type: WAN PTM over DSL, service type: data, IP: 90.254.98.247, device: ppp2 WAN

16.11.2017 20:20:56 WAN disconnected, WAN type: WAN PTM over DSL, service type: data, device: ppp2 WAN

Which isn't super helpful, there are lots of CRC errors. But I can't figure it out. Reboots do nothing aside from it just takes a lot longer to reconnect.

Vodafone seem very unwilling to send an engineer! They can't even seem to figure out how to put me on hold without hanging up on me.

Edited by deleted (Thu 16-Nov-17 20:34:25)

On the face of it, that looks more like you've lost PPPoE rather than sync.

Are those the only messages?

In reply to a post by WWWombat:

On the face of it, that looks more like you've lost PPPoE rather than sync.

Are those the only messages?

Sadly, yes. The router is such a piece of [censored]!

Ah well, at least you can have custom DNS unlike BT.

(This is working on the basis that we can't tell if it lost sync, or lost PPP)

As an experiment, you could try just manually unplugging the router from the phone line, then restoring it a while later, and checking whether you get any different log messages. Preferably at a time that you aren't afflicted by the problem.

Another step would be trying to monitor the number of CRC errors over time, to see if there is any correlation to the times that you see errors.

Another step would be to swap to a different modem that can be monitored easily with software. Even if you couldn't then make a PPP connection to Vodafone, you would at least get an idea of how stable the sync is.