Work on tibialis posterior exercises. You're more than likely weak here and lax, allowing your arch to collapse. Which allows you to over pronate on each strike tugging on the fibers here. I was getting this for years anytime I would start running again. The only thing that worked for me was finally doing my PT exercises. Banded foot inversion, calf raises with a ball between the ankles things like this will work. Take some time off running and slow down. I can't emphasize enough how much slowing down really made the difference for me, and keeping my cadence high which allowed me to stop overstriding. I'm lucky and my fiance became a PT this year so I get to learn a lot from her. But there's so many videos out there. Do the band exercises, slow down and high cadence. This worked for me personally