i also had some reboots of the device with a screen right before about the SD Card.
After the Reboot the Device goes back to 12h mode with the Clock (when previously switched to 24h)
Hi @Marian thanks for letting us know, I’ve started a conversation with you via email about this - it should be in your inbox 
I have the same issue, please let me know how to fix it.
Hi Shannon, Same issue for me 
Hi @ArnaudBP and @Bruce did you also get the SD card message? There is new functionality in 3.7.2 is if there is an issue it should restart and continue in the mode it was in (i.e. return to plane mode or jump mode, whichever it was in at the time), so that’s what it is doing when it reboots. I’ll feed back the clock change info to the devs. Will get this sorted and smoothed out.
No I just have the 12hour clock issue whenever I turn the device on.
Hi All, Same like Bruce, after turning On device. Many thanks