Subscription path model set detected to be out of sync. Will re-synchronize

A little background of the server:
We have a server that is gateway networked to ALL our other gateways - to grab tags and statistics / Shared tags.

Server HAD been working fine for the longest time - but now I am getting TONS of the following error: "[Ignition-eagig01] Subscription path model set detected to be out of sync. Will re-synchronize." (Ignition-eagig01 is a server out in Connecticut - we have servers globally).

This error is showing up for almost ALL my servers - sporadically.

What can I do to alleviate this issue?