Yep, this happens to me. I broke a brand new iPhone this way. I don't know this but for me when I have swelling/pain in my hands I'm not able to determine how much pressure I'm putting on something that I'm holding and tend to drop things. This happens pretty often.

I am constantly dropping things. *sigh*

I've had RA for 20 years and have had problems dropping things for a long time. RA effects the strengh in your hands.

I got up out off my recliner and mr right knee wasn't even working right. I tripped and almost fell into the glass cabinet. Weird. Both knees were replaced.

You know what? I'm glad you posted this question! I do drop things unexpectedly & it's also in my right hand. And, yes, I've assumed it to be RA related. Thought of doing hand exercises because my hands frequently hurt, and to strengthen them. Haven't done it just yet. Don't be too hard on yourself!