What speed are you getting out of the ADSL2 connction? Your modem should hopefully tell you.
Depending on a number of factors you may on the limit of what is a stable connection for you with ADSL2. If your modem allows it try adjusting settings which will back off the connection speed a little.
e.g. if I push I can get 12Mb out of mine, but it is unstable. When I back it off a bit I get 8Mb but at least it is stable.
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