Given the task definition and input, reply with output. In this task, you're given reviews from Amazon's products. Your task is to generate the Summary of the review.

I bought 3 sets. Out of box, 4 of them did work. After 2 days, another 3 broke. I am an electric engineer and fairly handy. However, they build the candle in way that is not for fixing. Also, there are a few candle just turn on and off randomly. I guess it is also caused by unreliable circuit inside.
Circuits are very unreliable although looks ok from outside