Hmm.. I have a clue to what may have caused the problem
A long time ago.. I decided to turn on the cheats and gave myself like 1000 everything but realy just wanted mana (cause that was the easiest one to get that) now I just decided to cheat and err destroy a unit with the cheats.. and when I did that on a certain unit.. the game automatically went to that "you lost" by domination bug
So even though I did this cheat.. something like 20 or 50 turns ago in my last game.. I did see it set off by one remove unit in my current game
In this case I removed a field attacker near a city I wanted to build and that set off the bug
Let that be a lesson to yah.. don't cheat..