Evan,
i did several tests today but i can't determine the cause. I tried removing the grounding, the error message still appears. It comes later when using wsjt-x. With jtdx, twice as many stations are visible during decoding and the message appears after 40-50 minutes. When it appears and I click OK, the message appears again when switching from reception to transmission or from transmission to reception. The message appears, but there is no change in the sound. In the case of jtdx, when loading and decoding the program, the cpu usage reaches 250% (the percentages of the 4 core threads are added). With wsjtx you don't get such a high cpu %.
By definition, it decodes far fewer stations.
I don't see a solution for the time being.
--
Gyula HA3HZ
HA3HZ