dn0, thank you for the response. Since posting, my issue seems to have disappeard. Thinking back, I realized that the problem started around the time I upgraded my network card driver. I rolled back the network card driver and haven't experienced the issue since...its only been a couple days so I'm still holding my fingers crossed. Rather odd that a network card driver would cause an issue like this. None the less, below are my readings.
Downstream Value
Frequency 615000000 Hz
Signal to Noise Ratio 36 dB
QAM QAM256
Network Access Control Object ON
Power Level 13 dBmV The Downstream Power Level reading is a snapshot taken at the time this page was requested. Please Reload/Refresh this Page for a new reading
Upstream Value
Channel ID 3
Frequency 21600000 Hz
Ranging Service ID 4595
Symbol Rate 2.560 Msym/s
Power Level 50 dBmV
You have a -8 downstream power level? Is that normal?