Garmin GPS shutting off randomly while riding
I've had my Garmin eTrex Legend HCx for almost a year, and I've used it on a few rides to either record a track or find my way (sometimes both). Until last week, it's been rock solid. Never a glitch or power-off.
But this time (on a ride to my parents' house), I suddenly found it had shut itself off about 20-25 minutes into the ride. I turned it back on, and it was fine for another half hour or so, then it was off again.
The batteries were installed fresh the same morning, and the battery indicator still shows four bars (indicating full), after about 6-7 hours use since then, so that's not the issue.
I kept turning it back on several times during the ride (five hours) and it was doing a bit better near the end.
On my way back home yesterday, I had no need for it during the first two hours, but I turned it on after that. It shut off within a few minutes. Turned it back on again, and it stayed on for 20-30 minutes. When I powered it back up the third time, it was fine for the rest of the ride (couple of hours). I turned it off myself when I arrived here.
Now, the question is, has it become damaged by the vibrations from the road? It did seem to mostly turn off during the sections with slightly rougher surfaces. Then again, I've used it offroad a few times (rigid MTB) and several rides in the past have been on equally rough roads.
The handlebar mount is sturdy, but not very good at keeping the GPS unit firmly in its place, so it rattles quite a bit.