Well, uRemote via Wifi is not that stable indeed. At least that’s my experience with the app on iPhone, iPad and Macbook Pro.
It has connection with the uTrack on and off. With the mobile devices it’s better but not as stable as just a LAN connected Macbook for example.
What I did experience is that with previous versions of MacOS it did work quite well. I do remember after installing Catalina on one of my laptops it started being dodgy through Wifi.