Profibus help please

full image - Repost: Profibus help please (from Reddit.com, Profibus help please)

So im fairly new at being a Controls Tech and we have a network that keeps getting "Illegal Messages" on all nodes in the network. 41 nodes to be exact. Any idea on where to start for this kind of fault? Also not sure what other info is needed to help troubleshoot but I could provide more if needed. If you guys could help that would be amazing. Thanks.

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