Losing wind staff while in use

So tonight I've had to get 3 wind staffs because my first disappeared, then the second... then the third.... people keep telling me they have unlimited uses but they keep disappearing. Each having a shorter use span. What is going on??

 

Wind staffs have unlimited uses.

How are you using the staff? You sure u keep it in your hand and don't die?

 

So when I use the staff I have an elytra and fly around. I'll casually be using it when after a use it disappears from my inventory. Also I never died once.

 

The only time i switch from the elytra is when i eat.

 

NOW IVE LOST A DIAMOND SWORD! OUT OF NOWHERE JUST *POOF* GONE!

 

Are u using an costume version of minecraft (like forch or optifine) if you do it could be lag?

 

I've been known to accidentally hit Q while flying and not always noticing and thus throwing picks and swords.