Speed just suddenly dropped for the first time

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I have been with BT for about nearly a year from TalkTalk before that, I hated TalkTalk with it's slow speeds (only had max of 50kB/s) when I switched to BT, I had constant speeds of 160-180kB/s, now a few days ago, they have seemed to dropped to 70-80kB/s. I don't know what the problem is but it seems to be quite weird, also I had dropped connections when the broadband would stay active for about 5 to 10 minutes then it would drop and have problems connecting to broadband.
I left it for about two days while keep resetting it because the BT wizard kept telling me it's best to reset the BT hub router and I still have slow speeds from now on...
I did a couple speedtests on www.speedtest.net and one test from BT website. The Speedtest.net says 70kB/s and BT website says 170kB/s, I have no idea what to do next...
Exactly what am I suppose to do, I hate making phone calls since I'm deaf and it's a lot of hard work.
My contract with BT is 8meg line or whatever with unlimited data usage.
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Search forum for quite line test dial the number use option 2 and listen for noise on the line an analogue phone should have no noise if the line is good a digit phone not recommended may have slight hiss but neither should have any clicks or crackles
If any post helps tick the star box on the left
Just cause Im paranoid dont mean they are not out to get me