Hi Joao,
Are you using a remote point to join two beams at a common node location? If yes, then this might be causing the first warning. You can try using the node merge option.
(305) ANSYS Mechanical: Node Merge - YouTube
You can turn on large deflections to see the stiffness update during the analysis.
To Use Large Deflection or Not, That Is the Question - PADT (padtinc.com)
On third warning: MPC Contacts in ANSYS - Yes or No? - FEA Tips
Please see if the above links help.
Regards,
Ashish Khemka
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