Wow, I've never had my 500 take more than 8-10 minutes to find signal and that didn't have glonass! The 520 is much faster, but I've only had it for a year or so and haven't had it off for any long periods of time. But the 500 sat for 4 months and it still only took the usual 8-10 minutes to find satellites. I *have* had issues where it says "Working ..." for long periods of time. When it finally finishes (this can take 20-30 minutes), I notice that all of the files on the device get current timestamps. I don't know what on earth (pun intended) it is doing reading the files on stored disk. But this situation only happened if when I unplugged the garmin from Mac without ejecting first. Shame on me.