Recently, my arm launcher is "uninstalling". Visually, my left arm still has the cyberware, but I lose access to the attack. When I check in the cyberware menu, there's nothing in the arms slot. I can go to a ripperdoc and reinstall it. So far, the game hasn't eaten it, therefore eating the money and mods I put into it. I suspect it has something to do with it defaulting to grenades. Honestly, the only reason why I'm using it at all is to provide a more convenient range option for my blade build. Even though it's way weaker than the grenades, it's free ammo, doesn't weigh anything beyond the 1.20 of the 'ware itself, and because it doesn't run out, I don't have to switch using an awkward menu system (either radial or inventory).