If you have internet connection issues constantly and are turning your modem/router off constantly ( even once a week ) to get a connection back , I may have a solution for you.
It maybe time for a new one.
Yes you should check with your ISP if the line is ok but having to turn it on and off all the time could be a sign you need a new one.
I should also say that the average life of a modem/router appears to be about 2 years and remember these are just " dumb " computers.
You should also check for any updates to these by logging in and checking for any updates