I recently got a XB7 modem and I have noticed a weird problem, Maybe someone can shed light on what is causing this. I got it delivered this past Tuesday but started noticing issues and Shaw dispatched a technician as I had Noise on my line. Thursday Shaw replaced my modem, Once tech left I had speeds on Wifi up to 750 MBPS. In the middle of the night the modem rebooted itself and afterwards got 150-200MBPS. I contacted Shaw Via webchat to ask what is going on and they said no idea maybe update. Later in the day same issue then I spoke to someone from Shaw and they finally were able to get the speeds up. Later that night I had a tv glitch so I rebooted my modem and back to 150-200mbps.  

Since this has been happening I tried to pinpoint the issue on my side and when I change the channel on my wifi to something like 44 on 5G the speeds are good. When it is set to automatic the speeds end up being 150-200mbps. Is there some kind of firmware issue causing this or something to make the modem go to that low of a speed? 

Thanks for any help regarding this. 

Gordon