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vpn pre-frag failures

Hello,

we have an l2l-ipsec tunnel between an ASA5520 and an ASA5505.

Both devices have configured:

        crypto ipsec df-bit clear-df outside

When I copy files over the tunnel to a file server (CIFS),

the windows client sometimes stops with an error message.

When this error occours, one can see on the ASA that

the pre-frag failures counter of the related VPN-tunnel increases.

Under which circumstances can pre-frag errors occur?

How can I fix this?

Thanks in advance, Mark

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