Strange relais noise switching VFO a/b

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Strange relais noise switching VFO a/b

PA3CW
Hello reflector guru's,
This evening i experienced some strange relais switching in the following situation:
I use my K3 on 502 kHz,  having the Config KXV3 set to 'test'
Because i wanted to make a crossband QSO with 80 meters I configured the subreceiver for CW on 3575 kHz.  So far so good. However, when i press A/B to change the VFO content of the receivers I hear many relais clicking, in a very slow sequence.  It sounds rather strange.  Also i don't know how the antenna will be configured in this setup, because of the KXV3 setting to test.
Any advise what is happening here?
Thanks
Dick PA3CW