problem in my lot

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I have this proble since long time ago. I dont know why is that happends at least 4 times 6 times aday. Some times whan I write rsponce to disscussion and I click "post respose" when there was error page come and said "cant find that page", so when I undo the exporer empty diccusion comes. So my every little time is wasting from this thing. So can you help me sort out this problem?