There is a bug that was introduced with SU14 but its really intermittent and apparently rare. I’ve only seen it happen to the C172 G1000Nxi (default upgraded by WT) but I’ve seen others make similar complaints about different aircraft.
What you’ll notice is that the CDI button won’t do anything and the XPDR doesnt seem to work and neither will the VORs.
I can’t find any pattern to the problem and I thought it was gone but it just occurred on a flight yesterday so I thought I’d ask to see how common this annoying little bug is.