Cannot upload sketches anymore

After testing Arduino LowPower Mode with example TimedWakeUp (see Arduino - ArduinoLowPower), which is working fine, I cannot upload new sketches anymore. The board is alternately 1s awake and 2s in sleep mode. During the sleep mode the board is disconnected and looses contact for uploading. Is there a workaround?

Which Arduino board are you using ?

Double tap the reset button!!!!! and it worked!!!!!!

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