orinoco ibss mode, channels won't stay locked

Hi, we can't seem to lock our tower access points onto a channel.  As you
know, there is no BSS mode for Hermes chipset, just prism.  So we use
IBSS, and on the orinoco clients it shows up in their client manager as
peer-to-peer instead of access point.  Anyways, we set the cards to
channels 1,6, and 11, but sooner or later it always defaults back to
channel 10.  Any way to lock a orinoco in IBSS mode to a certain channel?
We have a idea of what might be happening.  A customer or just someone
trying to associate is on a different channel, and somehow the
freeBSD hilltop switches over to that channel.  We've tried different
versions of freeBSD, 4.5 and 4.7.
Thanks for any help, Bob C


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