Water supply hoses should be replaced every five to ten years. Most new washing machines do not come with water supply hoses so make sure you buy high quality ones prior to installing a new washing machine. The most common lengths are 5 Ft ad 6 Ft. Get 6 Ft ones so it will be possible to pull out the machine and still work on it with water hoses attached.
To make sure the door seal on your front load washer doesn't catch mold - make sure every time after use you whip the seal with a dry cloth and leave the door open.
Check all pockets before putting clothes into the washer since foreign objects can prevent water drain.
If your washing machine drains too slowly, or doesn't drain at all - check the filter at the front of the machine if one is accessible from the outside.
Check you user manual for additional maintenance instructions.