[jonmb]

I also have the XPS and have experienced my WiFi dropping. Usually a few times a week. I've heard you can contact Dell support and they will send you a wifi adapter but I haven't tried it yet myself. Curious to hear of specific replacement options too.

[Macha]

I had massive issues with the Killer Wifi until I installed an (April 2018 iirc?) driver update from the Dell website. Dell's update tool didn't seem to install it.

[bogomipz]

That stinks. You would think a decent wifi chipset would be a solved problem in 2018. Especially from a company that has been shipping laptops for as long as Dell has.