Prototype freezing - removing mouse enter variant change resolved the issue

Suddenly today I noticed that my prototypes started freezing.
After some investigation I found that by removing the “Mouse Enter” variant change that I used for the hover effect on my buttons, the prototypes started working correctly again.

I’m not sure if this was the cause but it did resolve the issue. (note these had been previously working)

Image below to show how I had the buttons setup using the “Mouse Enter” and Mouse Leave" triggers to switch between the two variants.