Cleaned my ears, wasn't a lot in there but it kinda helped.
try getting a.. erm how do i explain it. its that string for glasses which saves the glasses if they fall.. i think that would do kinda good.. you could also try making them sticky, sugar, chocolate idk but its probably because of the shitty design and the buds they have. another tip is get an elastic gum and out it around your earphone and your ear.
get smaller buds or its just new earphones. I had 2 sets, one kept falling out of my ear because the knob sticking out which connects to the bud was too large for my ears, but another set had smaller knobs and i used the same buds