On 3/20/17 I received my LCD screen and front panel assembly. I successfully replaced and fixed the iPhone5 but on 3/30/17...

I have had this issue multiple times and repaired it with different methods. (1) First time I cleaned the dispenser motor contacts (2) Second time (one year later) replaced the entire dispenser motor (3) Third time (one year later) had to replace the entire main board. It’s been running fine since and that was 2 years ago now. HtH.