Instruct: Classify the given Amazon review into its appropriate rating category
Query: I used it 2 times only. After the second ...

I used it 2 times only. After the second time it started to self inflate every time I hang it to my backpack to recharge. I guess there is a leak somewhere. I am the only one who uses it so this cannot be because it was mishandled. Now I have to put rubber bands around it so it does not self inflate