Garage door springs are designed to fail. They are usually rated for 10,000 cycles. When your garage door springs have reached that number of cycles, they are destined to fail within a matter of days, weeks or months. Not years. That's why it is recommended that when one spring breaks, it's best to replace the other spring at the same time. But the choice is yours. If you want us to only replace one spring, you're the boss. Just call us at 772-646-4473.