hi Robert

A friend once told me that if i ever had problems with a "sudden swing meltdown" as he called it, you have to go right back to basics.
checklist:
a) grip
B) posture
c) alignment
d) set up. and takeaway.

since every swing fault can be traced to the tiniest change in one or more of the above, check them and correct any changes, and you'll have your swing back in no time........

good luck friend.....Terry