I don't know if this is the same problem that you are seeing, but I'll mention what I've run into, since it sounds similar. Its seems sometimes that if I make use of the single sweep radar button, this results in my SD radar no longer functioning. (At least, I think that is the cause and effect.) I was able to get it back working, again, by creating a save and restarting the game from that save.
Perhaps there is something else going on, here, which I'm not really understanding (i.e., what the single sweep radar button's features are). I'm running the stock campaign with v1.4 patch.
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