300 followers lost in a matter of an hour

11pm 29th june i checked my followers i had around 970+ followers and when i woke up around 2:30 am this morning i had 675 so some how i lost 300 followers in 3 hours how is this posibble? i post daily and my content is the same as it was last few months and all of a sudden it drops like flies is there a way i can see why people are leaving and unfollowing or is it just the luck of the draw at this point