How can I prevent a Canon Powershot lens error? I've had them three times with three different cameras. Twice after dropping, but last time not even that. Note that last time was with a different camera, that I did not drop. It may have been the Icelandic volcanic dust; the final days the cover would not close or open properly, and the final minutes the light sensor had a dark bias. I was extra annoyed it happened in the middle of a wilderness trek so I lack photos for the final week, as I did not manage to fix it (I may or may not fix it yet).
What are some good strategies of preventing a Canon Powershot lens error, or indeed the identical problem in other cameras?