ADSL Issues

Hello,<br> <br> DSMS is killing my network speed and also my network stability. I have a 10mbps adsl line, but for the last month, I have found my modem to be synching at 4mbps, 6mbps, sometimes 8mbps. I have replaced my modem, and my lightening arrester, I have tested without my lightning arrestor, with and without my filter (I have no other devices connected to my phone line), I have used a new filter. <br> <br> I had an engineer at my home to assist me and he managed to get me connected at 10mbps for about an hour before my issues started again. <br> <br> I have had uninterrupted 10mbps connection for years after I replaced all my copper all the way up to the distribution box (with new conduit too) and also all the copper all the way outside the complex to the main telkom distribution box in the street. Please resolve this.<br> <br> Thank you<br> Chris