Ceiling Pendant Light

http://www.wishihadthat.com/stratford-ceiling-tile.aspx
Made from UV Stabilized .013″ thick vinyl plastic, these ceiling tiles provide all the functionality of conventional drop ceiling tiles at a fraction of the weight. The feather-light construction creates a ceiling you can admire without the installation breaking your back or pocketbook! They are easy to install, easy to clean, stain resistant, water resistant, [...]

My kitchen ceiling light turned on by itself and then slowly dimmed to off. The switch was off. It turns on and off fine now with either wall switch. Is this dangerous?
I think Joe S might be on the right track ,It would not be common for a 3 way switch
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