This is one of those bug reports that I absolutely HATE to send, because it's so vague, and hard to define exactly what is going on.
Here is what I have observed over the last 2 or 3 days (I've never seen this on earlier versions). After sending a line of text, everything stops. The callsign that I'm linked to is greyed out. No ACKS/NAKS are sent, and within a few seconds (10?) Vara-HF sends a DISCONNECT.
Exiting and re-starting VarAC returns everything to normal.
Nothing has changed on the PC, and the only other software that is running is Log4 OM.