Everytime I pump my iso high (1600, 3200, 6400, etc.) I get this flickering issue. It gets worse the higher I set the ISO. Not sure if this is an inherent problem with the X5 in general or if there is something wrong with my unit. I have tried using the Anti-Flicker settings in my app to no avail, tried adjusting shutter speed and it didn't work either. This is with Manual mode and manual focus. Thoughts?