Fleet Formation

[mac5732]

I haven't had fleets disappear but I have had ships disappear in Tactical mode. They were not in range of any weapons nor were they hit. They didn't go over to the enemy, nor could I find them anywhere on the regular map or anywhere else in tactical.
For exmple, had 10 ships all types, vs 15 crystal dreds, my 2 middle ships just disappeared. After action battle reports showed they had been destroyed. They never fired nor took any hits, enemy fleet not even in range..... mac