RFI or common mode current. Confirm by using a dummy load. If problem disappears, it's confirmed and should be addressed.
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When working FT8, the frequency readout in WSJT-X will jump all over the place while transmitting. The radio is unaffected and remains on frequency and FLDigi is usually unaffected. However on occasion it will close abruptly. Radio - Icom IC-706MKIIG, Antenna 80M EFHW, Computer PI-4. Any ideas?
Paul AC7UT