WIFI connection poor on iPhone XS
Ever since I upgraded my phone to the iPhone XS I have been having problems with wifi connectivity. I live in a 620 square foot apartment, so it is small, and have an Apple Airport for a wireless router. I never had connectivity problems with my iPhone 7 but with the XS it disconnects all the time. I will get messages that I am not connected while sitting in my place, not far from the router. When I look it says LTE so it isn't connected. I can then watch it as the wifi bars show up and then it connects an then a little while later I'll be back on LTE instead of my wifi.
This is problematic because when it changes networks like this, it will log me out of some things. Also it is eating up my data on my wireless plan because I may think I am on wifi but I am not.
I am also having another problem with the LTE on this new phone. My phone calls used to be crystal clear and sound like high definition with the iPhone 7 but with this new XS it is like I went back several years and my phone calls are static and they drop out. Nothing else has changed with where I am making calls or my wireless provider. The only change is the upgrade from the iPhone 7 to the XS.
Does anyone else have this problem and found any fixes or know if Apple is working on this? I have read other things online with similar issues and tried their fixes but nothing works. I've tried turning things like wifi and bluetooth off and back on and then rebooting. I have tried resetting the network settings.
iPhone XS, iOS 12.1, 512GB