So for the past few weeks my M100 service has slowly been dragging its heels to the point where it is now becoming completely unusable. I'm lucky if I'm seeing above 50Mbps download and 0.5Mbps upload and the latency is just through the roof if I need to use a streaming service. Fortunately I start work early in the morning, so get a couple of "useful" hours but it goes downhill.
I'm using a wired connection and wi-fi is off, so the lag is not wi-fi. The BQM pretty much confirms the contention is to the external interface on the modem as the network drops to a reasonable level overnight.