Not sure if this applies to my previous post or not, but I'm seeing a
pretty large number of events not being sync'd to devices.

I have just over 3400 events sync'd, with over 14,500 not sync'd. Is
that more due to some people not having connected with their mobile
devices, or could it be something going wrong?

I also have 13 events that failed to send to sync engine, what could be
causing this?