Has anyone ever had their fingers suddenly curl up but with no pain involved?

A few days ago, I reached for my phone and dropped it because my fingers curled but would not close completely. It looked like it should’ve been painful,but it is as if there was no feeling and my hand would not do what it was suppose to do and so I dropped the phone but was able to catch it with my other hand.
I quickly forgot about it and just remembered a few minutes ago. Does anyone know what can cause this?
I’ve lost feeling in my hands before some years back and it turned out it was a pinch nerve in my neck but that was different. I had extreme pain from the pinch nerve and after a few hours I could move my hand but I lost sensation. This was a loss of sensation and movement, but it was brief. Same hand by the way.