I've got the same experience before, for my case - the 'wind' causes it. Cos during confinement, I washed my hands often and also on fan & aircon when bf my son. My massage lady recommended me to use ginger cream ( can find in jamu shop). I applied and massaged every nite before sleep to get the 'wind' out, it works well for me. I no longer felt numbness or frozen again, may be you wanna give it a try.