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I've ended up placing an order for a new 810 and I shall return the old one to amazon for a full refund once the new unit arrives.
After doing a full factory reset and checking auto power down was disabled, the device actually crashed more than before. I had it crash twice on the commute to work when just recording - not even navigating.
As far as I'm concerned the unit is a dud, and as good as I'm sure garmin customer service is, I don't much want to mess around sending off a brand new unit and getting a refurbished back etc.
Fingers crossed the new one just works out of the box!
hazzelfrazzel-
My refurb has been working fine since the reset. I've updated the firmware too to see if that made it die. No dice so far. I took it out on Sunday for ~300k with some navigation and some just ticking numbers over. My PT ran out of juice after 4 hours though but the Garmin was solid. So, the gremlins might have left me.
From now on I'm definitely only using Garmin maps though - the postcode/location search is enough to justify the cost to me.
hippy
The OSM postcode thing is known - there's a workaround for that but I've not tried it. Knowing how I use my Garmin, having Garmin maps postcode search is a big plus, although the OSM maps worked fine in other countries I didn't previously have.
Garmin support is very good, to be fair. They swap the unit (although buying a new 810 and then almost immediately getting a refurbished unit is a bit um well the opposite of satisfying). They respond fairly quickly and seem to want to fix the issue. I'll give this a little more time and decide if it needs to go back or not.
Neither, really. They initially told me to update firmware, then to reset and after I told them it made no difference they asked for it back and then sent a replacement.