I had this problem many years back, the plywood of the rocker bottom slowly loosened the bolt as you moved the scope.
The reason the bolt comes undone will be the friction of the rocker on the bolt , however a nylock nut or a standard nut, will lock the bolt to the ground board. Loctite will work as well.
You need to address the cause, not only fixing the effect.
My Azimuth bolt sits slightly higher than the rocker bottom so that the top of the bolt cannot bind on the top of the sealed bearing.
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