What metering mode are you using? Also, in "Auto' mode, what is your Exposure Compensation setting? Does this happen with or without flash? The touch screen can play havoc in your settings: while looking through the viewfinder, if your face brushe...
From Canon's webpage:(www.canon.co.uk/cameras/eos-m3/specifications/)Canon EOS M3 Specifications:ShutterTypeHybrid Single Blade Shutter (Electronic first curtain and mechanical second curtain shutter)Speed30-1/4000 sec (1/3 stop increments), Bulb (To...
Canon officially lists most of its cameras shutter life expectancies at between 50,000 and 150,000 (with the 1D models averaging a bit higher at between 200 and 400K). According to Kikin’s database, you should expect closer to 350K out of your 5D. It...