Lenovo New Ideapad 3 15.6"

I don't know if I've just had bad luck recently or laptops aren't made as well as they used to be. I had this laptop for about a year and a half and it worked perfectly fine. Suddenly overnight it slowed down significantly, to the point it was almost unusable. It would take minutes just to open a window. I tried everything to clean it and make sure there were no viruses. Finally I hired an expert to work on my computer. He told me it would take half an hour. He ended up spending HOURS trying to clean it and find the cause. No viruses popped up and ultimately he determined the cause was that the motherboard was likely dying. I couldn't believe how little time it lasted!