I have a TP Link AX 4400 router on a spectrum network. Worked fine for 3 weeks then on my iPhones and iPads. Now if you go to settings and WiFi it says no internet connection but it is in fact connected. I can go to speed test and it says it is connected and I get great upload and download speeds. Problem is that it doesn't update any apps or download any new apps. Firmware is up to date. Updated iPhones and iPads to iOS 18. Reset router to factory settings. Spectrum can only check if modem is connected which it is. Restarted devices and equipment several times to no avail. I picked up a spectrum router and installed it and everything works fine now, so I may take tp link back if problem cannot get resolved. Laptop, printer, smart tv, Roku and xumo all work fine.