Won't last

I bought the 2-pack in June 2016. One unit was installed to control 2 LED lights (total 50 watts). The other was held for later. The installed unit failed after about a year. The second unit was then installed as a replacement. It failed last week. Both units continued to show the time and their programming, but won't turn the lights on. The reset button resets the time and programming, but the unit still won't turn the lights on. These timers are easy to program and work well for a while, but don't seem to last much longer than a year.

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