I am trying out VDSL2 service in Phx. I can get close to 40/5 performance sometimes. But my modem has retrained 4 times in the past 24 hours and every time the provisioned speed drops. The SNR seems to fluctuate a lot. Even when the SNR is back up, the modem doesn't seem to try to reprovision itself at 40/5. It just remains at, for example 27/2. If I reboot it then it will usually go back to a higher speed. So does anyone have some information on varying SNR, how the modem negotiates speed, and if there are any solutions to these issues. Thanks
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