CAE

can a bad bov decrease the turbo boost?i had my boost set at 8lbs and it was fine at first,then the next day i drove the car for more testing all of a sudden my bov sounded differen't from the day before and my boost drop down to 3-4lbs instead of 8lbs. i already check for air leaks and couldn't find any,guys can please if u have any advice what causes the problem please let me know please,thanks