After using Phd system for over 10 years I have now starting using PR Hot wax and all is great with that. However I have just bought the PR roller and use cristal ice in it. On two occasions the legs that I have waxed have been left with randam red marks. On my daughters legs this also happened and now they have started peeling. The PR roller is at a set temperature and the wax wasn't too hot. Have lost all confidence in the roller system but not sure what to do. Any suggestions as to why this could be happening??