Microwave 30l (Lower Penwortham PR1)

It is a Hotpoint 30l microwave. It is only 3-4 years old. Most of the time it works fine but sometimes you need to jiggle the door to make it connect and work. This is happening more frequently. From once a week to maybe once a day. It has done this for well over a year so it may last a long time or soon break.