OK, note taken, thanks. Interesting, that specific device was in boot loop but I was lucky to find a firmware (obviously from some similar device) and I reflashed it and now everything works fine, except from this specific problem. I will use SD card and case is closed, no problem for me as it's a tiny investment. For me It was more to understand that phenomena because I always like to know the root cause of a problem. Anyway, I will also test (just from a curiousity) good old iGO8 and will report back.
later edit:
OK, I tested iGO8 and it works just fine, GPS receiver is stable, but it autodetects different baud as Primo. So I use that baud also for Primo, but it still disconnects. So from my point of view I came to a final conclusion that it's not the problem with the hardware but in iGO engine (iGO8 vs Primo).
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