Low sync speed until CPE is plugged in

[Nevexo]

I usually use a Huawei EchoLife modem (yes, yes, I know.) with my usual MikroTik router with the TalkTalk service - a few days ago the sync speed dropped to 15mbps, when the service is meant to be 65. 

I tried with a different modem, a DrayTek Vigor167 that I nicked from the pile at work, same thing, 15mbps.

Got out the TalkTalk CPE, connected that and went on it's built-in Wi-Fi, 45mbps! Our normal sync rate... 

Plug the Huawei modem back in and now it's syncing up at 45. It's almost like the TalkTalk CPE requests a DLM reset or something when it connects - are they lowering the sync profile when you don't use their magical CPE? 

I believe this has happened before, but I can't be sure, last time there was a fault it affected the phone line too, BTOR engineer said the pair dropped off the connector block. 

[Debbie-TalkTalk]

Hi Nevexo

Thanks for updating your Community Profile.

The line is in sync at just under 50mb. Can I just check, when the speed drops have you tried rebooting the router first before connecting a different router?

[Nevexo]

Hi Debbie,

Added it now.

[Debbie-TalkTalk]

Hi Nevexo

Please can you add your TalkTalk landline number to your Community Profile, we can then take a look at this for you.

Thanks