@tguartdesign - are you sure its Corona 9 and not 10? I'm using C9 daily and didn't have such issue even once, but i know that there are numerous complaints about this issue from the people who are using Corona 10 latest build. There seems to be a bug that needs to be fixed by Corona team.
By the way, Corona renderer has active forum and fantastic support team - you would get much faster and more qualified help if you'd ask about the issues there next time.