Unstable Fibre Connection

Hi,

We moved to TalkTalk fibre a few weeks ago, from Sky fibre. On Sky, we were synced at 13mb and had been for months. (We are quite a distance from our local cabinet hence the low speed). When TalkTalk was connected, we were initially synced at 16mb and this was really stable, up until the last week or so.

I noticed that our sync speed had gone up to 20mb (interleaved) and thought "great!". However, the extra speed appears to have brought about a lot of instability. It will be absolutely fine for a few hours and then all of a sudden go really slow (speedtest showing 0.5mb). I have to click the 'restart DSL' button on the admin page of the Huawei router, and then it will be fine again for another few hours. This is really frustrating!

I wonder if the issue is down to the target SNR on our line. On Sky, at 13mb, the SNR was always around 12db. When we moved to TalkTalk, on the intitial 16mb connection it was around 9db. At the current sync of 20mb, it is around 6db.

I'd have thought that me having to resync at least twice a day might have kicked the DLM into life by now to give us a higher target SNR but it hasn't. We were much happier with the 16mb/9db connection.

Or could it be that the connection is fine and the router is faulty?

Would appreciate some help please as it's driving us mad! Especially as we have TalkTalk TV - so when we are watching any of the streamed channels, it's evident immediately that the connection has gone unstable as the streaming goes all blocky and stops.

I've posted some screenshots below. One is from Jack Dinn's speed tester (it runs every hour on my server). You can see that over the last 5 days, the connection has gone unstable 8 times (that have been recorded - if I'm at home and notice it straight away then I restart the DSL before the speed tester has run it's hourly check). Download speed (green bar) drops to almost 0 and the packet loss (pink line) creeps up. Interestingly, the upload speed (blue bar) remains stable. The second screenshot is of my sync stats just now, after resetting the DSL.

Thanks,

Andy.