Knee question

I’ve been running a couple miles a few times per week the past 2 months or so. I ran all throughout high school and college and am just trying to get into decent cardio shape again

The last few runs, I’ve had this weird feeling in my knee at the beginning of my runs. It’s almost like my knee feels “dead” and I have way less power to push off that leg. It hurts mildly but it’s mainly just aggravating that I’m basically half limping along. After about a half mile or so, it seems to get much better and there’s only a slight difference between knees. I took a week off and just now had the same feeling.

Thoughts?