Linksys Wireless Router :: E4200 V2 Parental Control / Can't Get It To Work

I have tried both old firmware (2.37) then the Cloud firmware and now back to 2.37 again. the parental controls seems kind of fool proof but anyhow they dont work for me.If I set the internet access as denied at certain times, if the client is already connected when that time occours, it can continue to use internet (until it disconnects and tries to reconnect). Happens almost every time. And the biggest problem is that if I try to block internet access for a device like a cell phone, even though the user can not access the internet through the web browser, apps like Facebook, games etc can still access internet. Kind of useless parental control?!But I have tried to reset, reflash etc.Also I find this router pretty unstable, the only device that works flawless is my iPad (3), the laptops and cell phones at home loses internet connection every one and then, even though it seems like they have good connection to the router. Never been a problem with my earlier routers.