Is your wireless router not working properly? If so, there are two primary solutions: (a) Reset your router to factory settings and (b) get a new router. Just power cycling your router will not bring it back to factory settings, and if you reset your router and it still doesn't work well, it may be time to replace it.
To truly reset a router to factory settings, you'll need a paperclip, knowledge of where the reset button is, and to depress the reset button with the paperclip for 15 seconds.
Your router has a motherboard (just like your phone, your computer, and your tablet) and it may be doing more work, full-time, than any of your other devices. So, your router gets tired and (within 1.5 to 5 years) will likely start to perform poorly or simply stop working. Usually, problems will start out intermittent, but they will become more of a problem. It's heat, the circuits get hot and wear out. "Just get a new one" is often my advice.