there is another thread or two on this forum about beacons.
I had fits with mine, finally got it replaced. I have heard about many others having to get them replaced too.
In the beginning I thought they were a pretty good way to go, but now I would not install one. Mine worked fine in the beginning, probably about a year and a half, but I'm not sure when it all crapped out exactly as I do not regularly pull PAPR reports. But somewhere around the same time the beacon quit, so did the transponder, and then another transponder.
I have heard a theory that the beacons are interrogating the transponder so frequently that the old vacuum tube transponders can't handle it and they die. IF that is true, it takes away one of the biggest selling points for the beacons, cost. But, after I replaced my tail beacon, AND the transponder, I could have gone another route for less money, and a LOT less hassle.