problems with arduinodroid (i think this is because for the usb buffer)

Hi, i was using arduinodroid in a samsung tab and it went very well until yesterday, my tablet starts to say "no boards found". The cables seems go well and the tablet seems to reconignize that anything is connected and it powers my arduino uno.
The last thing i was doing is starting to use the serial, i had not do it before, it seemed to go well, i saw some data in the serial monitor, but later when I tried to upload something more, it showed me messages saying that it had problems uploading, and after that, until now, "no boards found".
So, I think something crashed in the usb buffer, and I would like to know if anybody know what could happen and how to solve it or know how to reset usb buffer?