Having a problem with my 4mbps line.

I've been using it for a few years with no problem, but recently it has started having disconnection and low speed problems.

1. At random times during the day, internet will disconnect. When it reconnects, speed will be very low - below 1mbps. SNR also will be around 6 - 10.

2. Reported to TM - they said my house wiring problem. I hired a contractor to check and change wire from my house to the wire pole. Same problem.

3. Reported to TM again - technician came and "fix" the pole outside. Still the same problem.

So this time I have reported to TM AGAIN and also CFM.

Anyone experience this issue before or know what might the problem be?