Sky Fibre Ultrafast intermittent disconnection

[Megahard]

I upgraded my Sky broadband to full fibre ultrafast 500mbp about 5 months ago. I'm happy with the speed but around once or sometimes twice a month I would lose complete internet connection. All lights on the ONT box will remain green but the far right light on my sky router will turn amber. The only way to resolve is to restart the ONT box by powering off for a minute before turning back on. Internet will reconnect after a few minutes. This week it's happened on 2 occassions which is quite frustrating as I work from home. Could this be a faulty ONT box?

[Chrisee]

@Megahard loss of the voice service which is what that amber led indicates is due to an issue with Sky's server not the Openreach fibre connection so there is no need to restart the. ONT as restarting the hub should achieve the same result. It is recommended to leave an hour before restarting. 

Sky do repair the servers but they are actually in remote locations so it takes time.