also, rooms with poor lighting, and windows with tonnes of sunshine pouring in. 

All these things will usually cause the oculus tracking to freak out, which is gonna make the game freak out and generally lead to a reset/re-anchor. 

If the game area shifts in any major way, stop and restart. This is new territory and we are testing the tracking limits.

also, keep your home tidy. Clean up, its good for your mental health.