I had the same issue when the channel was set to auto. I manually went through the channels to find one that works. Some channels are over-used depending on your WiFi air traffic in your area so worth checking that out.
I think to each his own really.. I have an 500/250 OpenServe line and to be honest I do wish OpenServe offered the 1Gb line, my work would have been soo much easier. The estate I stay in though is again bottle-necked by crooked people where they only allowed OpenServe in and have been blocking...