Two-year-old 7DII is suddengly shooting bursts when set on one shot / single frame. 'Bout ready to send into Canon unless I get a quick magical answer.
Thanks to all for various observations and suggestions. This is very embarrassing, but I want to stop wasting people's time (since I don't see how to take the post down). I very seldom use the HDR function. But I did recently . . . for got about it ...
