LED lights keep failing

When temperature can't dissipate from the heat sink, it can cause lamps to fail prematurely. An LED light may degrade because LEDs emit light that decreases exponentially as a function of time and temperature.
Here are some tips to avoid LED lighting failure:

1) The most significant cause of LED lighting failure is the source. For example, shipping may hit a connector loose and negatively impact performance.
2) To reduce the possibilities of LED lighting failure, ask the manufacturer about its testing procedures.
3) Look up UL registration number. Verify a UL mark by visiting the free UL Online Certifications Directory.
4) Search for DLC qualification. It means these have been tested and estimated to distinct performance.

I think you have a partial short around the switch in the fixture. You probably will have to return it and get another one.