I know there are many ways to skin a cat, and everyone has their own methods, but mine is not to sand for as many coats as you can, then to sand lightly to even the surface (if necessary), prior to appling a final couple of coats. Otherwise it's 2 steps forward, 1 step back each time you sand.
If you are not re-coating in a suitable timescale and are not obtaining the chemical bonding between coats, then you have no option but to sand.
Just my tuppence worth.
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