Vive controllers randomly stop tracking

[Lightningfighter]

I have recently been having issues with my Vive Pro controllers recently. They are only a few months old. I will be playing mid game and one or both of the controllers will stop tracking. SteamVR shows the controllers as being turned on but pulsate like they are trying to connect. If I select power off the controllers on SteamVR, the controllers turn off so they are obviously connected. When I exit out of steam & steamVR , reopen steamVR, the controller/s have unpaired themselves. I then re-pair the controller/s and then they work fine again. Anyone have this issue?