avrdude stk500_getsync not in sync resp 0x00 for UNO R3

board suddenly give me this message (avrdude stk500_getsync not in sync resp 0x00) when upload any program

is that programm bigger than 16k, and which operating system do you use?

just googled it and found THIS post, maybe it helps you. Seems to be your problem

You wouldn't happen to using Bluetooth, are you?