Did you get into get into the usual 192.168.100.1 to check status, signal, address, configuration?
You did say it was "yours" so I'm guessing you are the tech support for that one.
After 2-3 years of steady service, I am finding that I need to power cycle my Motorola Surfboard SB6210 cable modem 2 or 3 times a day to re-connect to XFinity/Comcast, my cable internet provider. This requires unplugging the modem, waiting at least a minute, and reconnecting. Once done, my router has to renew it's IP address etc. and then the computers can re-access the internet.