I had a similar problem and the way I got out of it was:-
Update Arduino to 1.6.3
Supply the board with it's own Power supply (12v) my usb kept dropping out on overload.
Make sure that for reasons unknown the the COM Port that the Arduino uses has not suddenly
Mine kept going from COM PORT 1 to COM PORT 7 !!!....... don't ask I don't know.
The "Eleven" is our Uno-equivalent Arduino-compatible board, but with a number of improvements including prototyping area, a mini-USB connector, LEDs mounted near the edge, and the D13 LED isolated using a FET. [Product page]