BES admin send as rights for users keeps disappearing

I am hoping someone can assist me with a BES issue.
The BES admin send as rights for users keeps disappearing!
I set up a new BES that worked fine for a few hours then the single user starts getting the red X when sending.
When I log in as BES admin  go to the user setting  of the user having the issues and review  I find that the BESADMIN user has been removed from the securities .
I  re add BESADMIN with send as privilege click save . It works for a while then the system removed the BES admin user in a few hours. Its very odd.
Does anyone know how to resolve this Send As issue ?
Thanks in advance for any assistance you may be able to provide.
Thanks
Aaron
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