I had a horrible experience with my Garmin recently and had to do a full factory reset. I was having to recharge the device after 90-100km and it was touch n go whether it would crash or not.
Changes made that so far seem to have made a difference:
1, Download velomaps and make sure only that map file is enabled (note: it is possible to have multiple maps enabled at the same time which makes it difficult to see the route, navigate and uses valuable ram).
2, Upload all new routes to external memory card.
3, Split longer routes into smaller segments of no more than 150km.
4, Select external memory card as the default location to save activities.
5, Purge saved activities on a regular basis.
Battery now lasts much longer and it hasn't crashed yet, fingers X.
Mine stopped working properly at the start line of a tt a few weeks ago. Very irritating. No stats whatsoever.
Conclusion is you need to clear all the saved activities as Mike has suggested above.
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