Hi Sl, it appears you are not in the us? I have read lots of posts in the past from folks in the uk/europe that have probs with digital timers. I know the voltage/amperage is different there, but couldnt tell you what the difference is. I would guess there might be power surges, or maybe a low voltage situation that might cause a problem, but that should create probs with every electrical device? Anyway, we all gotta use what works for us each. Peace and good growin'