Do these not last long or something?

after 3 years, mine is starting to work intermitantly. But then again, it came with an autopage alarm (not exactly quality)

any similar problems? I checked what I could with the wires, but I didn't see any disconnections (althought I didn't check the whole length, since its particially covered)

I'm about to go out and check for continuity just in case, but I'm almost certain power/ground is getting through.