Outlook custom form opening...

Hi, everyone!!
I have a problem: I made Outlook Com Add-in.
I have there some custom form based on Contact.
So I try to open this form about 20 times without closing and
everysing is ok, but on 21 there is an com_error!!!
contact_item->Display();
I close some forms and can open them again but not more than 20 items!!
Is there a limit to open form count?

can u post the code. So that i will be able to see how you have
implementd the solution and what is the mistake you have done threre