I had to take the GT-31 to bits again today, as it froze again. This is quite annoying, especially as I'm in rural Thailand where jewellers' screwdrivers are not easy to come by. And I had a whole day's exploration of Bangkok on the SD card. Luckily, I had split the day into 4 files, so I only lost the last file. I might even be able to retrieve that data from the internal flash memory, given a bit of time to fiddle with the NaviLink program.

I think I can see a pattern in the two freeze incidents that I have experienced so far. The unit seems to freeze if I use it without recharging the battery for a few days. The battery symbol on the display looks like about 90% full, but I suspect that this is a lie: the almost-full symbol actually means "on the brink of death". So from now on I am going to recharge it every day, regardless of what the battery symbol says.