hiss on quiet line is not normal - with cordless dull hum is often heard so have you tried using the test socket with filter to make sure problem is not caused by your internal wiring or faulty faceplate
have you had problems with connection dropping or just many reset as engineer tried to fix your conenction? it looks like all the drops/resets have resulted in DLM seeing your line as unstable an put you in a banded profile
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