I check/tighten my bolt every night when I fish Simcoe, Erie, Ont. and occasionally if I'm not on these waters.
I no of 6-10 motors that have fallen off from guys not checking. Even Bob had 1 come off on Simcoe.
You can buy spacer to go on your steering racket to stop motor from leaning to the side. The smaller motors have a screw that you can tighten to reduce this problem.