Torcuato, Just to throw this out there, I was running along good on my old chromebook until my city got to big and it started getting stream errors and they just got worse. Once I switched to a newer chromebook, I think I've only seen one since. On the PC I was able to turn off the animations. You can't do that with the app. Strange 3 devices at once, but if the PC's are laptops, it would be worth a try to turn off the animations just to see if it cuts the errors down and may let you know if you hit the same wall I did.