Initial penetration

I am trying to run a nlgeom simulation through Optistruct but the warning states that 'Initial Penetrations In Interface' but i checked using Tools -Penetration - Elements all , there was no penetrations or interference. Could you please suggest what could be the reason of this warning and how can i avoid it in future? Needless to say that although in itself, is just a warning but my simulation always fails after running a couple of hours. Sometimes even after removing all penetrations and intersections a warning message will be written in the out file. If there are no intersections and penetrations you can ignore the warning message.
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Initial Penetrations

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Initial Penetrations — Welcome to the LS-DYNA support site

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Contact definitions allow the modeling of interaction between one or more parts in a simulation model and have become a necessity in any small or large deformation problem. Depending on the type of algorithm used to remove the penetration, both energy and momentum is conserved. In order to detect the penetration due to contact, LS-DYNA first performs a global search using the Bucket-Sort approach and then a local search using the incremental search technique, to find the closest master segment for any given slave node or a segment. Once a closest segment is found, it projects the slave nodal coordinates onto the closest master segment to compute its orthogonal distance.
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