Office 2016 is adding reminders when syncing to calendar.com/live.com, how can I fix it?

[the whole taco]

Office 2016 is adding reminders when syncing to calendar.com/live.com

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running WP8.1 on a Lumia 930 and SP3 (8.1)
using Outlook on SP3 for calendar and email

If I add an appoint and have no reminder using Office 2016 on my SP3 the syncing is adding a reminder with what seems to be random reminder intervals. Sometimes it is 18hrs before the event, sometimes 15 mins. So I have been getting reminders in the middle of the night!
Only seems to happen on new ones, that is, if you edit an existing to a new date then no reminder stays.

My default setting is 'no reminder' for a new appointment/event.

It seems this was a bug in Office back in 2012/13 and had returned?

 

[the whole taco]

twice I have posted this question in the 'open question' slot and both times it has been allocated to a phone forum.
it isn't a phone problem. altho that's where the most annoying outcome of the problem arises for me.
it isn't a surface pro problem
it's a Microsoft sync problem.
I guess WC doesn't stretch that far.
thought someone might know tho