I'm using the Rift S with Touch controllers and when trying to use (attack) with the item in the main hand the item will switch with one from another slot. For instance my pick is in slot 1 of the toolbar and I'm mining by pulling the index finger trigger. I pull the trigger and it swaps to slot 6 and now I'm holding a sword. I select the pick axe again and I pull the index trigger and it goes back to the sword. I'll try other items and it keeps switching back to the sword. I try switching to keyboard controls and back, opening the menu, clicking all sorts of buttons. Eventually it will just let me use the item normally again. This happens many times during a session.

I've been playing and noticed two things:

1. The problem occurs after a long play session (+1 hour). Once it starts to happen it occurs frequently.
2. Going to the couch view will temporarily fix the issue. (Y button on Oculus touch)