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Internet speeds are ridiculous inconsistent

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I have Blast (up to 50mb/s) and it has been working fine since a tech came out  a month or two ago and fixed it, but recently, the download speeds have been unbelievalbly inconsistent (going from 40 mb/s to less than 1 repeatedly) while I'm lucky to get even 1mb upload

 

Speed test: http://stage.results.speedtest.comcast.net/result/533162404.png

 

Speed test: http://www.speedtest.net/my-result/3555706318

 

As you can see, the DL speed is ok, but the upload is awful.  

 

Here are my modem specs:

 

Model: Cisco DPC3008

 

 

Downstream Channels         Power Level: Signal to Noise Ratio:

Channel 1: -3.1 dBmV 37.9 dB

Channel 2: -4.2 dBmV 38.3 dB

Channel 3: -3.7 dBmV 38.0 dB

Channel 4: -3.3 dBmV 37.8 dB

Channel 5: -3.1 dBmV 38.0 dB

Channel 6: -3.1 dBmV 38.6 dB

Channel 7: -3.1 dBmV 38.7 dB

Channel 8: -3.2 dBmV 38.6 dB    


Upstream Channels         Power Level:

Channel 1: 50.5 dBmV

Channel 2: 51.0 dBmV

Channel 3: 51.3 dBmV

Channel 4: 0.0 dBmV

 

Can't stream (Twitch/Netflix) without the video pausing to buffer, even on low setttings.  Can't play any games online due to packet loss/lag  The speeds you see are just the high end.  It doesn't stay there.


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