The signal may be flucuating with the temperature. I'm having problems with mine right now. Also in DFW. I'm sure my signal has been bad here alwys, but never noticed it in the winter since it wasn't bad enough for the modem to completely lose connection. This last week or so, I've been having problems again and did some researching and learned how to check the signal levels. Believe it or not, during the mid-day my incoming drops sometimes to -19.3, and thats connected directly to the wall. I had to take it off the splitter because it will not even connect during the mid day, however as it cools, signal level improves (mine only gets back to -16 though). I've been keeping a chart of it every 5 minutes. Time Warner is coming this saturday to take a look.
Here is the chart: »
lkeeler.com/myDBMV.jpg as you know, today and yesterday where a little cooler with the rain, so the signal didn't get as bad and Sunday and Monday were in the 90's.
7pm is usually when it starts increasing with me. It probably is going too high. From what I read -15 to 15 is within specs, with 0 being the optimum. I wouldn't even use an amp for -1.