Vodafone Naked DSL speed issues

For some days now I have been noticing sudden drops in speed in my connection but without losing sync on the router. I was not that fussed about it until I started seeing a message on my phone saying "your connection is unreliable" when it was connected to the home WiFi.Yesterday, thinking it's a WiFi problem I swapped to the new HUAWEI HG659 while waiting for VDSL. Problem still exists and possibly has gotten worse. Sudden drops in speed and almost no connection. Line comes right by itself without resyncing. I was lucky enough to do a speedtest right on the time the speed was coming right again... http://www.speedtest.net/my-result/3309492991. Look at the graph... After I re-established the connection (reset DSL) all comes right http://www.speedtest.net/my-result/3309507149 . But five minutes later it happens again.I am about to switch to VDSL in the next few days, but this is frustrating as I can't even go on Facebook :(Any ideas ?DSL Stats

DSL synchronization status:

Up

Connection status:

Showtime

Upstream line rate (kbit/s):

1089

Downstream line rate (kbit/s):

16641

Maximum upstream rate (kbit/s):

1085

Maximum downstream rate (kbit/s):

19804

Upstream noise safety coefficient (dB):

13.5

Downstream noise safety coefficient (dB):

12.1

Upstream interleave depth:

0

Downstream interleave depth:

0

Line standard:

ADSL_2plus

Upstream line attenuation (dB):

3.8

Downstream line attenuation (dB):

6

Upstream output power (dBmV):

12.1

Downstream output power (dBmV):

18.5