OK, this has me stumped. I've contacted my installer and dealer to figure out what's up. Briefly, the FIS-B display on the NGT-9000 has become intermittent for some products. (Worked flawlessly prior to this spring.) That is AIRMET, SIGMET, and Turbulence boundaries appear and disappear every few seconds minutes, and METARS and TAFS display momentarily (or not at all) and then become "unavailable." Winds aloft don't display at all any more. But NEXRAD displays OK, and the traffic displays are unaffected. What's really weird is that all the FIS-B products I can display on my tablet EFB through the wifi adapter work just fine, including NEXRAD, METARS, and PIREPs. So the NGT-9000 must be receiving this information OK, at least intermittently enough to broadcast to the tablet. The transponder is working OK, ADS-B traffic displays OK, and the FAA reports of ADS-B performance are A-OK. I wonder if a bad antenna or data connection would be consistent with these symptoms. Or maybe corrupted software. (There is a ver 3.2 update from the 3.0 I'm running). Either that or it's time for warranty repair/exchange. If I have to pull it, I'm pretty much AOG until it comes back. Arg.