Modem disconnects on a daily basis

Type in 192.168.100.1 into your web browser, that should bring you into the modem, check on what your dB levels are.. Cut and paste your output in case this happens again. Your modem will have a log of the disconnects that you can use when talking to Comcast. It sounds like you might have a pwr problem with your dvr. Are they plugged into the same outlet? Are you able to contact Comcast while it is happening? As a workaround, try plugging each into a different outlet. I would open up a trouble ticket with Comcast and have them escalate the problem. If it is a comcast modem, they can bring you another one out.

Its likely that the node you are connected to is simply overloaded. And a million people are getting online at that time, and Comcast just cant support everyone... For this there is no fix, Unless you switch to another ISP