I was getting this problem while working with DMVPN
%ADJ-5-PARENT: Midchain parent maintenance for IP midchain out of Tunnel0
This problem occurs mostly because of NBMA IP address of Hub or Spoke is advertised in respective of routing protocol, As NBMA IP address is source of the tunnel it will cause the tunnel to flap.
In order to solve this problem, just simply suppress NBMA advertisement on HUB or SPOKE
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