Thank you @DarrenOC ! I'm aware of that issue on 16, it takes various forms, so I don't feel comfortable in saying "yeah, just do this" without having a look at the network. Support can force schedule this though, so don't hesitate to get in touch if you are hitting any snag.
Re the MSs, that does sound a bit bizarre, I don't think I've encountered it so far, it would have been interesting to snatch out of band logs to see if there was anything bizarre. One thing that I will call out though, is that when you have stacks of switches there is a timer that gets triggered when you initiate firmware upgrades, that's designed to give enough time to each switch to upgrade before they restart, so it doesn't break the stack. It may be possible that all switches downloaded the upgrade promptly and were just sitting there waiting for the timer to expire.
That last one, out of curiosity, does it happen on older models or even on current ones?
Thanks!
Giac
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