On my DPS I usually have a genie at the start of a round and then a guardian towards later waves which means swapping them out. I lost my first genie, likely because I might not have had it locked and vendor trashed it with the rest of my unlocked item box contents.
Genie number 2, 100% checked it was locked after each switch to the guardian and before vendro trashing, in time I just didnt bother to check and kaput it went.
Now genie number 3 is gone Im 100% certain it was locked, I didn't do anything special with it... HOLD on a second.... I thought I didn't do anything special with it... until I started writing this post and I realised I gave it to a different character for a bit then switched it back to my main. OMG... does that take the lock off??????