Default Folder wont open, lose app menu

From time to time, multiple times a day, a friend of mine wont be able to open folders. It will show the icons in the folder, but when he clicks to open it, it turns to a grey circle. At the same time this happens, when he goes to his app drawer, no apps show up. He has to reboot his phone.

Specs....

Stock, no rom, no root
4.3
3.4.0 kernel
Jss15j.i545vruemk2


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