I've got Comcast Blast internet. On ethernet cable, Speedtest shows 125Mb/s. Up until some recent time (don't know for sure when as wasn't checking), my wireless speed was 90-100Mb/s, which was OK. Now, however, wireless running ~50Mb/s on best connection/time, and 18-30Mb/s on other machines. I presume some update (Windows 7, AV, or some utility) is the cause. Anybody else have this and know the cause/fix?