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Altimeter giving false data post update

My Garmin 955 only had 1 issue post update in September.  It would not track golf shots. With most recent update, it still does not track golf shots and now my altimeter says I cl8mbed 21,000 ft over 4 miles. FYI, I live in Florida.  Sea level, not mount Everest. Hope Kevin at Garmin can fix this.