Where exactly in your thighs?
Both RDLs and GMs put a lot of stress on your glutes and hams. Could be simple fatigue from those, perhaps tightness. Do you stretch properly beforehand?
Another possibility: If what you're feeling is actually more in your hips, you could (again) not be stretching enough beforehand, or possibly standing with your feet too wide apart, which can strain your hips. My bet would be tight TFL, ITB and adductors. Those seem to be damn common problems for most of us!
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