Losing a stack is indeed a pain in the backside, but as others have pointed out, it is realistic. Some factions were even known for it: if you look at Byzantium's history, you'd see that there was LOTS of civil war and betrayal. And in my Byzantium campaign, I have lost a couple of stacks.
Then again, when I played England, Denmark and Sicily, I NEVER lost a stack. As Spain, I lost one in about 200 turns. So, I don't think that the problem is that bad, Roy1991, but you are just having lots of rotten luck.
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