Nari Ultimate won't stay connected

Looking at old threads, it seems like it is a known issue that the 2.4 GHz dongles for the Nari Ultimate can just go bad, likely due to heat-related failures. That seems to be what happened to mine. It was working fine for over 2 years, and just stopped working yesterday. It will seem to connect, but it won’t stay connected. It bounces back and forth between connecting and playing audio and then cutting out. Replacements online aren’t a viable option, in my opinion, as they cost between $30 and $60 and those are likely used anyway. Was there ever a real solution to this?