You may have a location/tenant quality problem kathrynd.
no, it is this way for all landlords who have any amount of rentals.
The problem is, tenants think that lease isn't really a contract.
Tenants are tenants,mostly because they have ruined their credit to the point, where they cannot buy a house.
Even on minimum wage here, they could buy a house. (min wage is $10.50)
Buying is cheaper than renting here.