Duel CQ in N1MM causes "antenna may not be changed during transmit" message in SSDR

While setting up and testing N1MM logger with a Flex 6600M, I am running into an issue while configured for Duel CQ'ing.  The duel CQ is started on Slice A and then switches transmit over to Slice B and starts a CQ there.  While it is switching back and forth between Slice A and B, the SSDR software will every so often pop up a message that says: "antenna may not be changed during transmit".  I assume there is some kind of timing problem where the relays in the radio have not switched completely before the next CQ.  I played around with the TX Radio Settings in SSDR as well as Duel CQ timing settings within N1MM, however haven't found the right combinations to keep the messages from appearing.  Anyone familiar with this issue that can give me settings that have worked well for you?