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Check out my posts on the previous page. Had the same issue with osm on an 810, returned the device and the 2nd was the same. Garmin advised they wouldn't provide support as it was the third party maps causing the problem.
I ended up returning the 2nd device and just buying a 3rd unit with the official maps bundled.
Had it about a month and no issues, I know @hippy also had a similar experience.
Where did you get yours from? Do they have a good returns policy? As I recall, I only ended up paying 30 quid extra from amazon to have the official maps, and it is also really nice to be able to search locations by postcode. Really handy for navigating on the fly, especially in london
hazzelfrazzel-
Gah what a PITA. Do you mind if I ask how much you paid for the bundle? (or did you just buy maps on an SD card)
Further question - does anyone know how up to date the current maps are? this http://www.amazon.co.uk/gp/product/B000L3APBK/ref=ox_sc_act_title_1?ie=UTF8&psc=1&smid=A3DY1ULX0WPWJW
seems cheap cheap, but then is only 2012 which seems a bit old. Are there more up to date versions?
branwen
New Garmin 810 user here, have had three random turn-offs in the last week. Is this par for the course? (all times > 50% battery, twice just recording, once when routing, using OSM rather than official maps)