Welcome Back!
I have leg cramps in my left leg, and it also has to do with position and flex. When I flex my toes, my toes and calf seem to spas up,and my foot has even rotated inwards 90 degrees. Like dystonia.
Since my PN has always been mostly sensory (small fibre) with some autonomic involvement, I assume that this has to do with motor nerves, though my nerve conduction studies were normal.
I take large amounts of magnesium and it seems to help, some days are worse than others and sometimes there is much abating,although I have tenderness in that calf 24/7.
On several occasions while flexing my legs at night while asleep I was woken by the most painful leg cramp,and my leg was twisted up and I couldn't control my foot. It passes thank God, but I still don't know why it happens either?