Lint in your dryer
I have a few firemen friends and they have advised me...many years ago now..that keeping your dryer lint basket cleaned out, is very important, after each load you dry. If it does build up and hard to remove...just wet your finger tips and it will hook right on to them. Even some doors need to be cleaned often. It is a fire hazard for all of us.
Another thing to watch is the vent to the outside...keep it clean and DO NOT block it with anything..it needs to vent..that's what the vent is for.
I am sure you all know this...just another friendly reminder from G-Ma :O)