I have noticed my epic freezes randomly whenever im using a custom rom on ext4. yet everything is fine on the stock rom. there are somethings that cause it to freeze such as trying to set the wallpaper, sometimes when ever im trying to send a quick reply in handcent or trying to save an image in the browser. I read on another thread by _-jay-_ that its data corruption but it didn't offer any solutions. I ran the SyndicateROM Frozen first and that froze the most and when it did the screen got rather bright and had lines running through it, removing the battery was the only was to fix it. After which when i turned it back on a lot of apps forced closed and i couldn't send any messages using handcent/stock app. Now im running the ACE ROM which i like better but still sometimes freezes but no force closes.