Christmas lights seem to be made to be single use and disposable

Does anyone else have the problem of Christmas lights stop working for no apparent reason? It does not seem to matter the cost of the sets, or the brand or age. I can check a set prior to hanging them up only to have some critical whole section just go dark the next day without being touched, rained on or otherwise fooled with. I’ve tried checking each and every bulb, their connections, wires for cuts or shorts and almost never find out why some section stop working. I end up throwing them out and resolving to buy heavy duty ones next time that are more expensive. But often even those will do the same thing. The new light sets and not the series kind that should cause the whole set to go out if only one burns out- individual lights should burn out by themselves and not affect other bulbs. That would be fine and easily correctable or acceptable. But for what ever reason whole sections are prone to stop working without apparent reason. It’s very frustrating to say the least.