If all four lights on your Winflo WRHLBY2S2 2-Watt 12-Volt LED Soft White Range Hood start flashing at the same time, it could indicate: - A power supply issue affecting all bulbs. - A faulty transformer or driver in the range hood. - A compatibility issue if non-original replacement bulbs were used. Typically, LED bulbs do not fail simultaneously unless there is an underlying electrical issue. Before replacing all four, try: - Checking the power source – Ensure the voltage is stable. - Replacing one bulb first – If the flashing stops, the issue may be with the bulbs. - Inspecting the range hood’s wiring – Loose connections can cause flickering.