Every time you program a teensy device it causes the USB port to turn off and on. Arduino Maker Workshop responds to a port being disabled -even temporarily - by resetting the upload and monitor ports ...
[psgarcha] took a year-old Arduino Uno on an international trip and upon returning found something was wrong. Every time he would try to upload, he would get the dreaded avrdude error, ‘stk500_getsync ...
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