I’d take a look at technique even if it is something you have been doing for years.
Your body is able to buffer some deviations in technique until its not able to. No warning nothing.
All of a sudden you can’t perform the skill any more or there is pain etc. something letting you know something isn’t right.
Have you look up/down stream of where you are experiencing this to find the root cause?
Where you see the problem isn’t always where it originates.
If you are working on things and not seeing change you aren’t getting at the cause of the issue.
Pro Episode # 21 – Pro-User Request Friday: Not Seeing The Change? You Need a Systems Approach.