[Elecraft] K3: Antenna not connecting on change to BC frequencies

[Nigel]

I recently purchased K3-100 s/n 20xx fitted with 2.7/400/250 filters, KAT3,
KIO3 & KBPF3.     Loaded into memory-3 is 3535 cw and in memory-1 0.917.5
AM. 

If, after selecting memory 3 I select memory 1, the frequency changes but
the antenna does not reconnect. (a weak signal is heard).     If I tap ANT,
A/B or REV the antenna connects and levels jump to 40 over S9. 

Tuning down from 1.800 there is a relay change click heard at 1.700, at this
relay change the antenna also disconnects.       Rocking the vfo up and down
about 1.700 connects and disconnects the antenna.

 

Is this a menu setting I am missing or something else?      Suggestions?

73

Nigel ZL2DF