I've gone through 3 over the range microwaves in 3 years.

Hi,

We moved into our house in 2012 and had an over the range microwave installed. We purchased it new prior to moving in. There was already a spot for it but the people who sold us the house took theirs with them. This microwave was an LG and it worked until 2014 where one day it just started popping and sparking from behind the control panel when I turned it on to cook something. We replaced the microwave with a Magic Chef one. This one lasted just over a year. Just in time for the warranty to run out and it too began popping and sparking behind the control panel when you turn it on. We replaced it with another Magic chef microwave but a different model on 12/12/16. Yesterday it, too started popping and sparking when I turned it on. Is there something I'm doing wrong? The microwave was properly installed. We even had the electricity checked. It read 120 volts on the meter the electrician used. My house amps is 200. My husband thinks that the popping and sparking is the magnetron of the microwave. But why do they keep breaking? Anyone have any suggestions?

I'm wondering if I'm the cause. I do run a daycare so the microwave does get a lot of use. Warming up bottles and cooking lunch every day. Do microwaves have a life expectancy before they go kaput? Could moisture be getting into the magnetron causing it to short out? Is it a requirement to run the exhaust fan on the microwave when cooking on my stove? I have to admit I'm not a fan of the sound of the fan so I don't use it as often as I should.

Any ideas or suggestions? I'm kind of tired of having to buy a microwave each year.

Thank you!