broken every time within a couple of months, multiple purchases

This product, and any other Sunbeam electric blanket that I've tried, invariably breaks in a couple of months after purchase. The controllers flash yellow, Sunbeam studious avoids address the broken controllers with flashing lights on the troubleshooting section. 

It's fraud against the consumer. No other way to put it. Do not buy. In fact, any electric blanket brand you decide to buy do a search beforehand using the brand name and flashing controller light because you're likely going to find the same manufacturer makes all of them and they all will have the same problem, eg Serta brand.