Hi Fernando,
Just to further amplify some of the ideas presented here, I have has this problem in the past the things that I check when this happens;
1. Try a different USB port / computer (I have had this happen before where the camera seems to lock out your control requests)
2. Change your frame rate and check that you haven't asked for a really long exposure
3. Try a different cable, this I have run into a couple of times.
I hope this helps.
Trent
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