broken every 3 LED bought at 3 months

I have the LED - spotlight since the spring of 2012.
Initially very good warm white bright light.
After 2 weeks, a spotlight was always dark, after 4 weeks of the second.

Within 3 months every 3 lamps have failed and with a burning time of up to one hour per day.

I have borrowed the spotlight Paulmann ordered, because I thought that's branded goods.
PS .:
My LED, s of Aldi and Lidl function after 2 years still.