my units keep disappearing

I love the game but my units and recruits keep disappearing. this has happened 3 times now, yet it will still say up top that I have 431 units but down below its zero, nobody to cut wood etc... im really thinking of deleting the game due to this.After youve put a lot of work and time into your game its just maddening

Fartyfan291 about Celtic Tribes - Strategy MMO, v4.7.1