I started a thread a while ago on losing waypoints and routes on an Etrex 20 due to a firmware glitch.
https://yacf.co.uk/forum/index.php?topic=70084.0As detailed there, I sorted it, but only by getting back to a PC to do some tinkering with Basecamp.
Could be a problem on the road.
As I said in that thread my firmware is rather old due to my wariness of Garmins update procedure, but the unit has just lost stuff again - though I managed to get it to see the stuff by switching it on and off a few times.
I understand that losing stuff like this is a "feature" of the aged firmware I'm using - I won't bother listing its number as it's so old/dates from the release of the unit about 18 months ago.
So, to the point, since I think you can update incrementally, which firmware version would folk recommend?
I don't want to go down the PC path of updates beyond what I need which introduce features of doubtful use at the cost of slowing everything down/introducing new bugs.
I can cope with the occasional freeze which just demands a switch/on and off (mine does that sometimes, no problem) it's just the total wobblies that I want to avoid.