i have this problem too i cant leave any units alone without a general or they betray - and i found out why my current king (a lame excuse of royalty) has a influence of 1... basically everyone agrees he sucks at being king and so if left alone they switch sides ... hes 45 too so long wait till he drops off im kinda glad its a 0.5 time scale campaign as this period where im handicapped wont leave me with no turns left