Have Comcast as my ISP, and have no speed problem during the day online,but at night,it slows to almost a crawl.Comcast guy has been here,but unfortunately,its during the day,so didn't experience the slowdown.Comcast sent new software to the modem,but no change. He said he has also pinged the modem at night from his home some how, but it was normal.Comcast provides a file to d\l,and that has proven to be terribly slow at night. As I mentioned above,everything is normal during the day.Thanks Papat