In my experience, for now, just downgrade it to 2.7.3 version. OS3 has some serious issues with snow, mostly sync issues and bad behaviour on some patches.
2.7.3 is rock solid, 2.7.5 has some random sync and arp issues too.
I've tried too os3 and switched back as soon as i understood that i can't keep working with it and having to panic the snow every 2 mins...
Cheers
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