Since LED drivers often have shorter lifespans than the LED array or fixture it's paired with, you should check for signs the driver is failing before replacing the lights. Normally, a failed LED driver will just stop transmitting power, but a failing driver may just not regulate power the way it should. The two major signs your drivers are failing overdriving and underdriving. Overdriving is when the driver is sending more power through the LEDs than they can handle. This can cause overheating or premature failure of the LED array. Underdriving is the opposite. The driver is sending less power to the LED lights which causing decrease light quality and output. The efficiency of an LED driver suffers greatly from heat damage if the ambient temperature exceeds the maximum operating temperature the driver is rated for. So be sure to check what your driver can handle.