VO2 max went down after hard reset

After the blue triangle flashing non stop right before my run this morning , I did hard reset . Went running,  later on showed my vo2 max went down by 5 points !  I  was at 47 and suddenly after a run it was 42 . This was after hard reset .

I removed and re added the device to connect app , everything synced but vo2 max never back to normal . 

Whatever happened with garmin today is so annoying Expressionless