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slow, laggy connection, T3 time outs

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A few months back I have had similar issues on and off for several months, then out of nowhere the issues seemed to correct itself. I thought finally Comcast fixed whatever what was wrong and all was well and didn't think anything about it. Today it seems to be back again. I ran several speed tests and my download seemed in spec for blast 50 (55-60mbps) My upload however was only 150-300 kbps. I ran the dslreports speed test and got a rating of F for bufferbloat? I attached my modem signal and log screen shots. Modem: SB6121 Router: WDNR4500 Switch: D-Link DGS-1024D Is this likely a Comcast issue? Or could it be possibly something on my end?

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