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This is a first.
One thing I should ask is how are your APs set up, where is your DHCP server?
It sounds as if your PE is sleeping the wireless and when it wakes up it asks for renewal of the ip address it had and the DHCP server sees it as a new request and offers a new ip when the PE expects the old one. That is the trying to get ip address you are seeing.
When you restart the PE it has forgotten the old ip address and so accepts what the DHCP server offers.
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