Smart Key Problems (Unlatching itself) & Replacement

I just bought the leather fob holder at the Toyota parts department. Some other Prius owner told me to get one because when it was in his pocket, the other keys broke the button on the fob so he had to get a new key. About $10 is worth it to me so I don't have to get a new one.

 

Sounds like your wife had a defective key fob. I'd think it'd be replaced under warranty, but I'm afraid it's too late for that as it's now lost.

 

I put my all alone keys in a closed pocket and my wife put them in a small purse in her handbag.

 

Same here. I think the key is very secure in the fob especially the fob is dependent on the key being secure otherwise you will lose the fob or the keys since all the keys are attached to the fob.

I think the button was pressed accidentally, which caused the key and the fob to separate. I doubt it is a lose connection or faulty fob issue though because I've had mine for 6 months without problem and my wife uses hers and she puts hers in her handbag as well.

 

I think your wife is probably afraid that you might get upset if she lost the key so she came up with the notion that hers are never that tight.
If you lost the key why do you need to change the FOB? You can just live without one set of manual keys, I've never used them anyway.

 

May be defective or just a freak accident. My fob is so secure I had to work at it to get the key out to show a friend.

 

The Gen3 key is a bit of a PITA to remove from the fob. IMO the Gen2 design was better. I use the key all the time. If I lost the fob I'm not sure I'd pay to replace it.