After Riverside Heights (level 13) I've stopped receiving new tasks. Now I'm level 15, unlocked Docks, and so far I didn't get new tasks after completing those from Riverside Heights (I got only 2 survivors requests for recources) Is this a bug or I did sth wrong?
I don't think you're doing anything wrong. It happened to me too, but I can't remember if it was at the same level. However, I recieved new tasks after a while, so don't worry. I think it has something to do with your level and when you level up, you'll recieve more tasks. I can be wrong though, I haven't play the game lately.