I suffered from increasing frequency, and intensity of RLS for about 40 years until it got so bad that I had to do something about it.
I worked out that as it was worst in the evenings and disappeared overnight, that it may be food related. After much head scratching and experimentation, I pinned it down to E202 food preservative. It's used in almost every margarine and many dip, sauces and ready meals.
I now only suffer when I'm really tired, and can tell that I've had some within half an hour of eating it.
Problem solved - except for eating out. I avoid any sauces that may be ready made.
It would be interesting to see if this works for anyone else.