Try using the windows key + r and then enter \\192.168.0.1 in the pop up window.

Lets see... if you had a wired extender or a second router and connected all the WIFI to it and had a plug in timer on the extender/router to power off at night....

Be sure you are using a good cable and power cycle the printer and router.

To replace a Comcast Gateway (Modem and router combo) first you need to go to the Comcast web site and look at the modems that are compatible with Comcast. You can get a Gateway or a separate modem...

Does it happen on both 2.4 and 5 GTZ? What I would try is change the SSIDs and connect one wireless device at a time to see if one of the devices is causing an issue. Could be an old device...

If it were me, I would contact support and get a replacement. Also consider a UPS. I use a UPS that has Automatic Voltage Regulation (AVR) for my router, modem, main PC, security system, and phone...