Hello,
I have been having problems with this fantastic software doing a stand still or "freezing up" after about 3 or 4 minutes of inactiviity in the program. This has been happening for some time, and I have been putting off writing this so as to not disturb Simon's more important issues. However, I have tried everything I can think of to find a solution. For example, if I stop to listen to some music for a bit or waiting during a recording, then it happens.
This started when I began using my new RSPdx with the software, while prior to this I was using an Airspy Discovery with no problems freezing up at all.  It even happens  with the lowest setting of bandwidth or even low gain settings.
Once the program freezes up, I have to click on the stop button in the tool bar to release the freezing and then click play again. If this is caused by something I am doing incorrectly, I would love to know what I can do to make it stop.  Thanks! 
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R,
Nick
N6LPO