Do you use a USB bluetooth dongle?
If yes, add a small USB extension cable between the dongle and the port, a few centimeters are enough.
If no, antennas improve reliability a lot. I swapped my internal M.2 bluetooth module to a more modern one and added magnetic antennas to the side of my case. No more disconnects since then (without xpadneo).
They could also finally allow you to start games without updating.