thanks Ken, do you have any suggestions or tools that may help me to
figure that out?

Ken Slovak - [MVP - Outlook] wrote:
All that means is that something is holding a reference to the original
item and it's taking a while for it to go away. That's classic behavior
for something that's finally getting hit by the garbage collector and
not being fully released until then. You're going to have to put your
detective's hat on to find what that is.