Old Garmin GPS Keeps Freezing Mid-Hike with No Clear Pattern

I've been using a Garmin eTrex 20 for years on my weekend hikes, but lately it’s been freezing randomly while I’m out on the trail. It usually happens after a few hours of use, and the screen just locks up - no buttons respond, and I have to pull the battery to reboot it. I’ve already tried updating the firmware to the latest version and resetting the device to factory settings, but no luck. This is frustrating because I rely on it for navigation in areas without cell service, and I’m worried it might leave me stranded on a longer trek. I’ve noticed the freeze happens more often when the battery is below 40%, but I’m not sure if that’s a coincidence or related. Has anyone else experienced these freezing issues with older Garmin units? Is the battery likely the culprit, or could it be a hardware problem? Would swapping in a fresh battery or a different model be my best bet for reliable navigation out on the trail?