I sometimes put my headphones in and find that music is already playing - I can usually tell how long it's been playing for depending on where I was last up to. Same for podcasts.
I've wracked my brain to figure out why this is happening. I thought at one point I may be accidentally bumping the play button on the headphone cable but I'm fairly confident I've ruled that out.
One thing that seems to trigger it is doing a touch id unlock after leaving the phone alone for a minute or so.
Has anyone else figured out what's going on?