So, I noticed that after getting a 4th upstream, the new upstream says 16QAM instead of 64QAM, and the other 3 upstream channels will sometimes randomly switch from 64QAM to 16QAM and vice-versa. I also saw the new upstream using QPSK one time. I was wondering if this is normal, if this indicates that there is an issue going on? I looked at other people's screenshots on here and saw that people with 4 upstream channels had all of them in 64QAM. We did replace our modem, but nothing changed.
Here's some screenshots I took of the upload changing from 64QAM to 16QAM.
http://i.imgur.com/3JOT4On.png
http://i.imgur.com/ttRlevw.png
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