Dead leg

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For the past few days, ive been having this weird dead leg sensation in my left leg. It’s almost like a muscle spasm. It doesn’t hurt, but suddenly my muscle tightens up and I can’t move until it loosens again. It’s in my left leg up near my hip, but in the front. It makes me almost fall over every time. It’s been happening frequently when I’m walking. I did message my doctor on the portal bc I don’t think it’s anything of major concern, but I was wondering if anyone has experienced anything similar? It’s not a pain or a shooting sensation like sciatica.