For a test, does a computer hardwired directly to the C7800 with an ethernet cable have the same problem ?
Not a computer but my ring alarm is hardwired and it drops. I get the notification that the alarm is on cellular backup every time it does it.
What do the modem's signal stats look like ? Try getting them here http://192.168.100.1 or here http://10.0.0.1
Please post the *Downstream Power Level*, the *Upstream Power Level*, and the *SNR* (Signal to Noise Ratio) numbers.