An unusual complaint?

Hey all! My name is Derek. I've searched forums, threads, Googling, etc. To no avail, and without solution. Perhaps here?

I am currently using an S5, SM-G900T1 (certified refurbished from Amazon) purchased a few weeks ago. Yes, I'm behind the times. It says it's running Marshmallow 6.0.1? Is that correct?

My setup: Using the default music app playing mp3s stored on the SD card. Output through the headphone jack, connected to a 10A guitar amp. Phone stays still and untouched all day at...

An unusual complaint?

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