I may have spoken too soon ... I have one instance (now) running on 630m and no band hopping I decided to start another, off the Elecraft K32 ... two mins ago I heard it switch bands.
No idea what the difference was .... however, that said, I DID run it with band-hopping all night long and it never did jump.
Upshot is that WSPR on the K3 is band-hopping all of a sudden. sorry to bother.
BTW Bill The 'second' instance runs off my "Red Pitaya" and through HDSDR, into WSJT-X [WSPR] and is on 630m solely
[edit] and I just discovered I forgot to change the band of the Red-Pitaya instance (No Radio and Rx on VAC Line#2) so had a few 630m decodes WSPR get posted on 40m