I'm on M600 and since about October during peak hours my speed is drastically reduced to anything under 200MB, sometimes much lower. I've had 3 engineers out with regards to this and non of them can find faults or can admit to it being over subscripton. Outside of peak time (midnight-6pm) I generally get full speed without issue
I won't bother posting my router stats or BQM as I've done that before.
Just wondering if anyone else in ST1 is also having issues with speed during peak time only?