I've been having this same issue with Sonar Platinum on a large project I'm working. The audio files are imported from a live concert with a 40 piece orchestra, so each track starts at 1GB. I don't do much clip editing, almost no cuts, mainly clip gain adjustments, and grouping instruments by kind (violins, cellos) which feed their subs (strings) but Sonar keeps picking on a few tracks for no apparent reason and swelling the size of the audio until it crashes Sonar when it tries to draw the audio image. I've seen these 1GB audio files grow to 12GB!! This is an insane problem and even after at least a dozen crash reports sent, CW hasn't even replied to me. Worthless. I only have another week to finish this mix and I've wasted at least two weeks fighting this bug. This is a serious fault and incredibly stupid for a DAW to be doing. Honestly, this level of software failure makes me question my choice. ProTools is looking better all the time.