There are some elementary things you can do yourself. Hello! No Metal, iron, copper, any metalic elements. It is best to use bowls or containers that are labeled as being microwave safe.
You should also keep your microwave clean. It is not hard to clean it out a couple times a week (or as needed) with a damp textile. evermore unplug it before cleansing. If you find that there is grime that does not come off, then put a cup of water with a couple tablespoons of lemon juice in it to heat up for two or three minutes. This will loosen the food stuck on the microwave, fashioning it easier to clean.
If something is broken, and can’t be fixed, throw it away. Nowadays, it is so cheap to buy a new one. But if you think you can fix it, cal a handyman. . It is unsafe to use a microwave that is having problems, not to mention the fact that the longer you use a microwave that is no longer working properly, the worse it will get and it is likely to become irreparable after some time.
If you have just bought a microwave, check to see if it is still under guarantee. Then take it back to the stores, and they will repair for no money, . You may also be able to return it or exchange it if the service man finds it to be defective.
If the damage is high, dump it. . Check and see what brand name and model the microwave is; there are many different brands and some companies work with particular kinds of microwaves. Try to find a company that has experience and expertise in your model, room and brand name of microwave.
Shop around for used parts. Try to get an estimate of how much the repairs are going to cost you, as sometimes it is actually cheaper to get a new microwave than it is to have repairs done, especially if you own an older model for which parts are hard to find.