When i use my whammy bar on a high note, it only last for like 2 or 3 seconds such as on the 22nd fret on the high E, when im playing master of puppets solo, the last note where you bend from 22, when i play tha note it only lasts for like 3 seconds and then i lose its sound.

I have a ESP MH-400 with Emg 81 and 85. i am wondering if it has something to do with technique? or what?