I then decided to move them to phone storage and problem disappeared. Then I noticed that media seemed to be running more than it should. Not quite sure what was happening until a started seeing notifications that my phone was preparing sd storage about twice a day. That answered both questions.
I'm currently on version 14, but it's been happening since 13. Never had this problem with 12, so I just figured it was a bug that needs squashing.
Sent from my phone with an identity crisis.