Two flights today CYYG - CYYZ, CYYZ - KDCA…lost ATC on both flights. Happened after about 2/3 of the flight. No ATC instructions to descend, contact approach, contact tower. What a bug-ridden piece of software. Was going to attempt another flight, but gave up on the idea as it would likely end in disappointment as most flights do these days. Lame, lame, lame.