its sad how everything has changed, i was inactive for more than a year and my bot has never been attacked even once, but i found today how to solve that problem, here is a guide for you:
1.log in to your bot 2.check whos online 3.attack all available(online) bots at your level 4.wait few minutes
eventually you should see the message "Your bot has been attacked 1 times!"
have fun - bots are alive !
ps. if it doen't work don't get upset, just keep trying :D