I noticed the mac address Flapping but it only start jan 1st not before?  has there been an update to the meraki switches that could cause this? ... View more

I agree with @alemabrahao .  I would block it for everyone and then use group policy to enable it for admins (allow access by exception). ... View more

Puts hand up nervously ✋ ... View more

@tlucy there were quite a few reports of similar behaviour (more slowing down to a pretty unusable level as opposed to no connection) particularly with MR42 and MR52 accesspoints.  The 28.6 firmware release does appear to have fixed those issues. ... View more