Got it. Can you chek in Debug menu how much memory you have?
Before Raw Video enabled:
Free memory 162k+3868K
Image Buffers 720x480,720x480
After Raw Video enabled and after raw video recording in full screen (1920x1080):
Free memory 162k+3720K
Image Buffers 720x480,1904x1274
After raw video attempt to record in 5x zoom following "Memory error MB"(1920x1080):
Free memory 162k+3720K
Image Buffers 720x480,1152x762