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@Tumbleweed
I have a bike that has this problem, The crank is still square, and the much harder spindle looks fine too. It's a strange chainless bike with a drive shaft, but I think you may want to replace/upgrade the crank bolt (sometimes they dont fit snug - it should also be the allen key type if pos.) and then torque about 10% more than specified.
Grease the inner flange of that crank bolt.
Also, it's always the non drive side that comes loose as the drive side does not carry much or any real torsional load on the axle. Left side transmits power through the spidle and puts a lot more stress on the Square taper.