Hi @SamROV,
It’s most likely this is a hardware issue (as @williangalvani was describing), but if you are getting inconsistent connections to QGC I would suggest trying BlueOS (which has built in repeated checks for the autopilot) on your onboard computer instead of the Companion software. If you’re already on BlueOS then try updating to the latest stable version, and if that doesn’t help try updating to the latest beta version.