I'd have more appliances if I had the space.
I have a Frigidaire refrigerator and it's gone through a number of defrost timers. It must be on number 4 or 5. The last time I needed one, my brother told me to buy 2 of them, to keep one on hand. That was good advice. Fortunately, mine is fairly easy to access through the console on the ceiling of the fridge, where the temp controls are, so I've been doing it myself (thank you, YouTube). It's been about 3 years since the last replacement, a record for this fridge! I've taken the old ones apart and saw that the gears are plastic. I think that plastic gears become stubborn over time.