I just got my Fiber install last week in Oakland. Starting yesterday it's connection has been dying in the middle of the day, everyday. Power cycling the sonic fiber modem restores service (I own my Netgear router). Will I have to be doing this every day? It's happened yesterday and today in the middle of work. If so I can use the strategy I did with cable modems, and have a power timer cycle it for a minute in the middle of the night.
Have you worked out if the issue is with Sonic's equipment or yours? What do the lights on the Sonic ONT indicate when it's offline?
Do contact support, they can assist! But note that if they dispatch and the issue turns out to be with your customer-owned equipment, a visit charge would apply. This is the risk in using your own router instead of the Sonic provided equipment.