Internet Drops Every Morning

Every morning for the last month and a half, I have experienced loss of my internet connection. We are using the Panoramic gateway that was provided by Cox, and even had it replaced recently but it hasn't helped. Like clockwork, at around 8:45am-9am, the router restarts on it's own and then takes so long to reconnect. The light on the gateway just blinks green and can stay that way for hours before we get the solid white light. I currently WFH and need a stable and reliable connection, so this is beyond frustrating and inconvenient. We had a tech come out who said the lines and signal were "fine", so it's like we're stuck. Has anyone had this issue? Any advice or suggestions are welcome!