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Some time ago our family owned a decade old second-hand maroon-colored SUV. Due to how old it was, parts of it frequently break down. Problems often start with something minor, like how the air conditioning isn’t as cool as it should be, or the automatic lock doesn’t respond as fast. When we go and get it repaired at the nearest auto repair shops, the problem gets fixed… for a while.
After a few days or weeks, bigger and bigger problems occur like the air conditioning or automatic locks failing completely, and the engines failing to start. By then we return to the auto shop and pay for repairs and new parts which work for a week, and then OTHER parts of the car start failing after a while.
Mistakes and bad luck does happen, but sometimes the problems aren’t caused by those. This is the biggest mistake that you have to avoid if you don’t want to keep losing customers and eventually lose business (or lose your career).