lnc0 problems on vmware

[RJ45]

I Am using FreeBSD 4.9  and it works very nice with vmware.
my guest host is windowsXP and I Am running FreeBSD from vmware
inside windows XP.

I have these errors in the logs

lnc0: Missed Packet -- no receive buffer lnc0

what does it mean ?
I Tried to search on the archives but no useful threads for my problem.
This happens when the system is on high CPU load.
thank you

Rick