I did on my brand new s5, but I returned it within the 14 day window with no penalty. Went back to my iPhone 4S.
It would glitch mostly when switching between apps while multitasking. Also had problems with operations.
Ex: wouldn't send a photo in text message even if taken inside messaging app. Says file was too large.
I was disappointed. It seemed more like programming and software issues as the hardware was all great.
