I have asked one of TalkTalk's OCEs to pick your thread up and investigate it for you.
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Thanks for the update and I'm sorry to hear this. I've re-checked the connection stats and I can see that the SNR and sync speed are varying quite a bit.
Does your master socket have a test socket? Is the voice service still ok at the moment with no noise on the line?
Apologies for this.
Is the voice fault (engaged tone) still present if you test with a corded handset at the test socket, with the router removed from the line?
If you dial 1571, do you receive a message to advise there are messages waiting on the line?