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So quite often in the evenings I notice my SNR goes down to about 4-5dB. Is this something the router should sort or is it related to my line/ISP?
Certain routers hold your SNR closer to the target better than others - the DG834GT is one of the best (a long side the Speedtouch ST585v6 & 2Wire 2700HG in my opinion) but at night it will be more unstable as the street lights come on, people turn on their lights, central heating comes on, tv's are turned on and so on - they all cause electrical interference which make your line noisier, making it harder for your router to keep a stable SNR. Around Christmas time my SNR will fluctuate quite a bit as Christmas lights are the main offender of electrical noise
There is not much you can do about it really, you already have a Broadcom-based router which are able to keep a stable SNR better than other brands of chipset
Has anyone else been getting really slow WiFi access and Web GUI access with the latest DGTeam firmware by the way? I've had to switch back to the standard DG834GT Netgear firmware as it's unbearable over wireless! (same wireless channel, the least contended one around here too)
Cheers