hb randomly turn off ??

Hello i got problem last 2 days i was runing 5man dung bot my pc crashed and had to re-istall HB i istalled new one and i turn same settings on same accs on same chars they start run in half hour or so 1 of the hb bots turned it self off no error msg's nothing just poof and its gone was thinking to my self huh ? wtf so i downloaded the zip fail runed 1 man dung x 5 for a night everything worked perfectly this morning i put same 5 bots with same settings as before poof they turn off again randomly every 20-30-40min or so any one got an idea why this is happening and how to fix it ?