A case now of monitoring the router stats and keeping a record of how they change over time.

BTW radio interference can travel many miles, and probably find the SNR margin is worse once the sun has set

The SNR Margin is now up at 18.7db, thats quite a dramatic change from last night and from the usual 13db.

The new modem/router should be here today so ill get that hooked up and see how it goes for the next few days.

Probably because the night time noise has now gone (due to ionosphere) and the modem will only recover the spare margin and pick up the speed if you reboot it, i.e. turn off count to ten and turn on again

So I got the new router and its been a bitter sweet experience.

Within an hour of the new router being installed the sync rate went right up to 2800kbps, as the old router did every time it was rebooted, but unlike the old router, which quickly fell back down to 1700kbps, the new router stayed at 2800kbps.

This then must have kicked the exchange into rising my IP profile right up to 2.5mbps! So for a couple of hours my download speed held strong (no drop outs or messing about) at 2.34mbps. This is what I have been fighting for, granted a small increase from 1.2mbps but this is double what I have been getting so I will take every last drop and be overjoyed all the same.

But before this glorious new bandwidth could be enjoyed out of nowhere the sync rate dropped right down to 1780kbps and so the download rate went with it, even though for about an hour afterwards the IP profile was still showing 2.5mbps.

Eventually it too dropped right down to 1.25mbps (even though with my sync rate it should be 1.5mbps).

So here I am, back where I started with only a taste of what I can actually achieve but can't seem to hold on to.

My plan is to wait for 14 days and hope that the exchange can come to senses and not only raise my IP profile but with a noise margin of 18db, hopefully come to realise that I can actually receive 2.5mbps.

If you have any ideas on what may have happened here I would love to know your thoughts. Cheers.

At a guess the sun set, and the amount of noise picked up from AM radio stations increased, caused the modem to resync, or was a transient noise burst e.g. heating pump or turning on a CFL light build and that noise has now gone away and the noise margin has improved.

If the sync rate is low, but noise margin high then the modem will sit at the low sync speed until you actually resync it

What's the best way to get a proper re-sync?

I'm worried rebooting the router will have a bad effect and possibly somehow the exchange will see it as a fault. I know you mentioned it being ok to do it in moderation but I tried it a few times when the sync dropped out but it kept coming back to the low 1780kbps.

Would leaving the router off for a length of time be of any benefit?

1. If the noise margin is low then no point in trying a resync
2. Only resync once there is lots of spare noise margin

Or if still unsure, then one resync a day during daylight hours should be no problem.