One controller will consistently not reconnect after wireless disconnect

[GaryMansell]

I have a new Vive Pro, wireless and 2.0 tracking system.

 

When the wireless adapter loses sync and then regains it, the HMD and the RHS controller always seem to reconnect to steam VR OK, but the LHS controller does not seem to do so. It shows as flashing green in Steam VR and I have to power cycle it to get it to reconnect to Steam VR again successfully.

 

Why does only one controller suffer this issue and how can I prevent this or fix this?