Have you tried using a Class 10 card? Class 10's are specifically designed for high-demand repeated read/write use like our dashcam's demand, and have solved issues for others in the past (although the prox sensor isn't going to be tied to it at all)
The 'Lexar High-Performance microSDXC 633x 128GB UHS-I Card' is advertised as a class 10. It seems to work just as well as the BlackVue card that came with the camera. I think it's the camera itself that's flawed.