When i've just been rebooting the router now the downstream changes between 34db and 35db wtih upstream between 19db and 21db.
If by that you mean you rebooted your router several times in quick succession, that will make the system think the line is unstable, and will hike the noise margin for a long time, to reduce the speed and give reliability. In other words, that is the worst thing you could possibly do.
Apart from that, see the Anonymous reply
. Talks a lot of sense.
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