Emergency Mode mid flight with nearly empty SD Card on 2.10.5

[lienmeat]

What I know:
I've changed very little with my TX16S other than recently upgrading firmware to the 2.10.5 recently, but this happened one time on 2.8.x too about a year ago, and I don't know why. SD card is 16gb Sandisk Edge HC 1, this one to be exact pishop.us, and only 162 MB is used, with 15.75 GB free.

I was flying FPV, and I don't know exactly what was going on on my Radio's screen at the time, and only know it went into Emergency Mode all the sudden because I lost RC link and the plane went into RTH mode (iNav saved me, thankfully) allowing me take off my goggles, see it was in Emergency Mode, and then restart the radio and recover. This happened a few minutes into my flight, and everything seemed normal to me until it happened. The other time this happened on 2.8, it also happened unexpectedly, and I never figured out why, mid-flight. I don't know where to start looking other than logs, but I don't see anything interesting there (other than it suddenly corrupts at the end).

More info (let me know if something else would help):

• MOST of the time, over the last ~2 years, this Radio with this SD card has been rock solid.
• I have the Radiomaster Ranger with the latest ELRS flashed to it (3.5.3, just flashed newest as of last night, actually, so maybe that's it?).
• I use the iNavFlight/LuaTelemetry widget when flying this plane, which was in use at the time.
• RX was HAPPYMODEL 2.4G EXPRESSLRS EP2 with ceramic antenna.

My flight log until it corrupts is attached (I removed the GPS column, the rest is intact).
flik sdb fc-2025-01-08-000545.csv

I appreciate any insight you can provide. I don't want this to happen again when I don't have RTH working right.