@Jarod Carlisle
This has been an ongoing issue. It's not a radio issue (I have an FTM-400XDR as well), but the ongoing saga has been detailed extensively in the thread that I'm linking. Read over it, and if you have any suggestions on something to try, I'm sure John and the rest of the SN team will be all ears, as they've been pulling their hair out trying to figure it out for a while now. Unfortunately, programming/coding is not my strong suit, so I wasn't much help myself.
Without further adieu, here's the thread of the SN/APRS saga...
Hey John, it appears APRS to SN has become unstable again as it is not pulling location information. I have included a screenshot from APRS.fi in my post. Nothing shows on SN for that same time period.
stormtrack.org