How do I factory format this phone? Need to start from scratch.

[fuzzybabybunny]

So I've used Syndicate and RandomRom. I've installed them over and over from the stock EC05 Rom, but each time after about a week the phone will randomly reboot and get caught at the startup animation. Upon successful reboot I'll get continuous Force Closes. Journaling is ON.

1. I use the Android "Downloading" screen to flash to the stock ROM, wipe data and cache and dalvik over and over.

2. I re-download the Syndicate and RandomRoms to make sure they're not corrupt.

3. I flash CWM Purple to root the stock ROM.

4. Install the custom roms and do more cache/data/dalvik wiping.

5. After a week or so I get the FCs mentioned above.

WTF is wrong with this phone?

Is there something that is NOT being wiped entirely when I flash to the stock ROM? This whole FC thing and then ROM re-install has happened literally 8 times.