The gradient color of the UV changed suddenly

Quick answer：

The phrase 'UV gradient color changed suddenly' could refer to a sudden change in the color gradient of an object or design that uses UV light, such as in a projection or lighting setup. This could be due to a technical issue with the equipment, a change in the program or design settings, or an unexpected interaction with the environment. Troubleshooting might involve checking the equipment, software settings, or environmental factors.