I had a problem w one of mine that was about 3 yrs old. The plastic cover to the sensor had gotten so crazed over from UV damage that it stopped picking up motion more than 5 or so feet away. I had to toss it in the recycle bin at work. Not a bad run though, it was a refurbished primos that i got a good deal on. the other one i bought is still going strong.
New fish, looking for advice.