IP_VFR-3-OVERLAP_FRAGMAENTS in cisco logs (+ some strange behavior on lan side) after switching to 1 gig fiber from AT&T.

Anyone have any insight or path towards trouble shooting?

We are running DMVPN (Dual spoke) tunnels. This is the first of these lines we have turned up and are using the same config we would use in our ciscos that we would for any standard internet connection (cable, dsl, etc.).