Seem to be having a wireless problem

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OK I have been trying to diagnose why downloads on my Tablet are unusually slow all of a sudden. For the first two weeks I had no problems but now downloads aren't as snappy anymore and the youtube app barely keeps up with the video.

I tried a multitude of things... changing the wireless channel, setting it to 5 Ghz, settings the power of the transceiver to default. All still give me strange download speed 5ghz was better but not where it used to be.

So then I opened the terminal emulator in Rom Toolbox and started pinging the router. Well what I found confused me even more.
I set the ping tool to ping 10 times. The first ping was fine about 8ms and it will steadily climb over the next 4 ping to 110ms! Then after that high ping it will drop back down to about 8ms again and steadily climb back to the 100s.

I don't get it what would cause this? This router isn't even 4 months old!

And just to verify I went on my laptop (wireless) to ping the router just to make sure nothing weird was happening and every single ping was 3 or 4 ms.

Well OK I figured it out. Apparently the GT 7 Plus doesn't like a channel width of 40mhz. At 20mhz it happily downloads anything. The pings are still quite high though but at least it doesn't take 3 minutes to download 10 megabytes on this thing anymore.