Also have an XA2 Dual; Very happy with it.
I’d recommend you to reflash the 4.5.0.18.
Here, BT ant Flashlight are working perfectly.
I don’t use Android so much but noticed the freezing with Waze a couple of times.
About Navigation, there are some threads that could be useful for the XA2:
https://forum.sailfishos.org/t/gps-stopped-working/1181/664
Especially this post if you don’t mind using Google to assist your GPS:
https://forum.sailfishos.org/t/gps-stopped-working/1181/425?u=ric9k
And, hardawre wise:
https://forum.sailfishos.org/t/hardware-xa2-gps-trial-to-fix-it-for-debuging/10133
Pure Maps and OSM Scout Server are what I use for daily navigation. They are great IMHO.
But they are native SFOS apps. In that sense, installing the Android version (really exists?) of these apps on SFOS is useless/nonsense.
You should install them with CHUM or Storeman.
Then, if your antenna board is still healthy, you’d be able to navigate,
Even with no connections as you can download the maps you want.
Good luck!