internet drops at around same time every night

Hello,

ever since upgrading our modem and router through Cox about a month ago, every night the internet briefly goes out then comes back on at around the same time (approx 7:30pm cst). It goes out for both the 1 ethernet user and the 1 wifi user. It comes back on within a few minutes, but it disconnects streams and games for both of the 2 users. When it isn't disconnecting, the internet speed is fine.

I reset the modem through this website and manually, but I'm at my wit's end. We spent a lot of money to get better hardware with Cox but it's now interfering with streaming which is a source of income here. We've never had this issue before we'd "upgraded" our hardware.