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Has anyone looked at your technique and mechanics for the skills?
It may not be a mobility issue it could be a technique/mechanics issue. Especially where it is something that returned from before.
You addressed the symptoms of the issue and had improvements for some time, but without addressing the route cause of the problem it hit a point where your body isn’t able to buffer the deviations in technique.
Did it ever return to 100%? before it reoccurring?