Topic: Problem with SME 5.5

[Maxi]

Hello, I have SME 5.5 with Update 3, plus PortFowarding + SquidGuard Filter Controls 3.0 with (Content Filtering + IP filtering Control) Enable.
My problem is a Internet Service(Proxy) into the Lan, He don´t give service in few random moments. Wherever the SME internet tester is Ok, the Lan don´t have internet. Ever in random moments. I sow the HD Led indicator work to much only in these moments. I think, a same service o process are working, but I don´t make anythink to do this one.
The only process work in background,(i Think) ,is the update for the BlackList, but not 2 o 3 times in the same day.
Maybe could be a Problem with te HD o HD Controller??????
Please I need a Help a lot!!!!!!!!!!!