Hello DiverDon;
Are you using torque arms to keep your axle nuts tight?
Constant acceleration and brakeing twist the axle back and forth
eventually loosening it (once time catastrophically for me, but that's another story.)
https://goldenmotor.bike/product-category/parts-and-accessories/torque-arm/You can find them for much less, or if you're handy you can make a better one.
I took a flat plate about 2"x4" of 1mm steel. I drilled a hole near one end that
was the diameter of my nut. (Not here so I can't measure) Then I filed (dremeled) the
nut shape into the hole so it barely fits over the nut.
I chose to make one point of the nut point 15 degrees off the center line of the plate.
(That way turning it over gave a +/- 30 degree offset. Just arbitrary)
Then I shaped it so I could put a screw through the fender hole, and finally
trimmed the excess material away.
I spray painted mine gold for accent.
Repeated for the other side.