Soundfont "hiccup".

Ver. 4; Especially noticeable on wind instrument, an abrupt nipping off of sustained note sound, as though too short a sample. It seems to be effecting all samples, so maybe its a systemic. It really ruins an otherwise okay rendering of the sounds. I find myself focusing on waiting for it to occur,again and again. Also, is there a way to control the vibrato on instruments such as flute. Way too much! Thank you for your input!
CDK