Thread revival ! Since I can't create new threads yet I have no choice. 
My Samsung Galaxy Express, 1.5 yrs old and stock randomly does the same thing. Last night phone is sitting on sofa table as I'm watching TV and all of a sudden it kicks on and starts playing a song from my micro sd card I'd saved and not played for 6 months as I rarely use my phone for music. Only way to stop it was pull the battery.
Also recently randomly beeps and shows that it's charging when not doing so. About a week ago it started itself up in the middle of the night after I had turned it off hours earlier.
I have no scientific proof, but it seems to occur more in evenings after I've used the Voice to Text a few times that day and have to delete and re-speak when it isn't good at getting it right. It's the only thing I have noticed that I've done different when it starts to occur.
Thoughts?

My Samsung Galaxy Express, 1.5 yrs old and stock randomly does the same thing. Last night phone is sitting on sofa table as I'm watching TV and all of a sudden it kicks on and starts playing a song from my micro sd card I'd saved and not played for 6 months as I rarely use my phone for music. Only way to stop it was pull the battery.
Also recently randomly beeps and shows that it's charging when not doing so. About a week ago it started itself up in the middle of the night after I had turned it off hours earlier.
I have no scientific proof, but it seems to occur more in evenings after I've used the Voice to Text a few times that day and have to delete and re-speak when it isn't good at getting it right. It's the only thing I have noticed that I've done different when it starts to occur.
Thoughts?