Camera in question = Canon PowerShot SD880 IS
I Google-searched this to no useful avail --- I don't think Google is nearly so useful as it once was.
Just sitting here at the desk, I have been playing around, trying to better learn various things about this camera and check out various CHDK settings.
This happened twice within fifteen minutes; I press the shutter-button half-way; the little picture of a camera (bottom left of screen) starts winking; then all of a sudden an orange light starts constantly flashing, the screen goes grey, and I lose all control of the camera, no response to any button I press.
I believe it would have kept this up until the battery went dead.
During this, the lens remained extended.
Nothing else was working, so I opened the battery door, at which point the flashing stopped and the camera turned itself off; the lens remained extended -- even after I closed the battery door.
After each of these occurrences, a press of the "Play" button and the camera instantly came back into action as if nothing had ever been amiss.
Before this took place, I had been noticing that sometimes, during normal shooting, a half-press of the shutter-button did not seem to achieve anything, or it took a very firm half-press to get any action.
The way it acts, I almost want to add half-a-drop of WD-40 around the edge of the shutter-button, but that might not be a good idea.
What could have caused this flashing orange light and complete loss of control ?
If and when it ever happens again, do I have any better option rather than opening the battery door ?
Thanks for reading and all help is appreciated.

