Hi Merien Hakkani

In Odoo database cursor are opened at the beginning of the request and closed after the request is processed so it means that if you are using a new thread the cursor could or couldn't remain open when you wanna use it, normally it wont be open, so you may need to create a new env for self.env  with a new cursor attached in order to make it always work

Hi Axel Mendoza

thank you very much for you answer , i tried this 

api.Environment.manage()

new_cr = registry(self._cr.dbname).cursor()

new_cr.autocommit(True)

self = self.with_env(self.env(cr=new_cr)).with_context(original_cr=self._cr)