This forum posts may help. Also try this Dell support page. I have also seen posts from users that suggested installing only the driver and uninstall the Killer Intelligence Centre and any other Killer software just leaving the driver. One other thought, if you have SmartByte installed uninstall it and disable it in Task Manager.
Hi everyone,  I come here as a last resort. I spent hours with Dell support and my internet provider on the phone but nothing worked. My Alienware m15 R5 and WiFi are not working properly working together. My m15 R5 is working great on every other WiFi. My WiFi is working great with every other devices. One of my friend as exactly the same laptop and it's not working either. I tried to update the Killer WiFi 6 AX1650x 160MHz Wireless network adapter (200NGW) but still not working. The only way to make it work is to plug it to the modem.  Please help!
m15 R5, my WiFi not working properly