I have also noticed this timing issue with WSJT-X 1.8.0 FT8, K3 #2545, an XP laptop running under CAT control, with external U7 soundcard. WSPR runs without timing issues. Past incarnations of WSJT have run on this same setup with JT65 on EME with no timing issues that I remember. DIM4 runs and updates the pc time every 5 minutes. No difference if KAT500 is on or off.
However, I do make plenty of contacts on FT8, all failures seem to be band fade.
73 Eric WD6DBM
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