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Upload Speed Issues

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Upload Speed Issues

I've been having sporadic issues with my connection for the past 4-5 months, recently switched modems and still experiencing the same issue: drastic drops in upload speed at random intervals lasting anywhere from a few minutes to a few hours every day. I have tried resetting the modem multiple times to no avail. I am connected to the modem via router with an ethernet cable.   

 

Speedtest during a bad hour

Speedtest during a good hour

 

Note the drastic difference in upload speeds: 3Mbps vs 16Mbps

 

I pulled the log from my modem (Netgear CM1100) below:

 

Modem Logs

Cable

Downstream

Upstream

 

Any suggestions?