My Apple apps on all devices have stopped working and I have to continually reset the router. I have had my WiFi setup for 6 months and this just started. The apps work if I turn off my WiFi and use wireless carrier.

Your router csn be brand new and still fail.

If all of your devices are not working, then this is usually either the router, interference in the area (built-up areas and big buildings can have lots and lots of Wi-Fi and that can and usually does interfere), or there’s a problem with your ISP link.

If your Wi-Fi and devices all support it, try switching to 5 GHz and disable 2.4 GHz, as 5 GHz tends to be less crowded than 2.4 GHz, particularly given 5 GHz doesn’t penetrate structures as well. as 2.4 GHz and that’s a Good Thing in built-up areas.

Did a Wi-Fi network scan in one location, and found over a hundred Wi-Fi networks. Suffice it, that site was inevitably going to have problems with Wi-Fi networking. Switching to 5 GHz helped some. Some.

Wi-Fi scanning tools are available for macOS. I’ve used Wi-Fi Explorer.

You are welcome. See if anything here helps.

Connect to Wi-Fi on your iPhone, iPad, or iPod touch

Troubleshooting Wi-Fi issues in IOS.    

Have you checked with the Internet provider to see if you need a new router?