i've been having a strange problem with ubuntu lately. i searched in the forums and so but couldn't find anything. the things is that text in firefox and text editors stutters or freezes randomly. for example, when i am writing and url and suddenly want to erase it, the last letters freeze in their place for a few seconds while the others are being erased. or when i am reading something in the text editor, it mixes paragraphs and such, like an old and crazy epson inkjet printer.. please help?