Firewall Flex 200

Friends, my flex 200 is blocking the internet pages of my network. At certain times of the day, I have to disable Policy Control, then apply it and then enable it again to be able to browse the internet. Everything was working perfectly, but I've been having this problem for about 20 days. To be able to browse as I said, I have to disable Policy Control for a while and enable it again. What can this be? I'm trying to talk to someone from support in Brazil but it's difficult, I'm not getting.