For two separate mornings this week, my feed suddenly drops at around 5AM and then is off and on intermittently until around noon. The only reason I know this is happening is because of the email that I get when it is down. Comcast says it is not an internet issue and that my modem is not logging any downtime. They've been out here once and changed out the modem etc, then the problems resolved. I've changed Ethernet cables, coax, jacks, etc. to make sure the problem was not on my end, but I don't believe it is. Without staring at the Comcast router all day, is there a tool I can use to either eliminate them as the source or prove that it is them? Thanks in advance!!