Windows mixed reality controllers lag and disappear

Hi,

I bought a hp reverb g2 headset and controllers about two years ago. They were working fine at that time.  I tried them again recently and now the controllers lag and frequently disappear. 

I have tried buying a usb bluetooth adapter. I have removed and re-paired the controllers. I have reinstalled the mixed reality driver.

If there is anything you need to know about the PC spec please ask and I will find out.

Is there anything else I could try please?