Intermittent internet connection on SBG10

I’ve had this router for a little under a year now. I haven’t had any problems until recently. In the last few months, connection has cut out at night typically around 9pm. It would cut in and out through the night. But start January 1 (writing this on January 7), it started to cut out more frequently spreading to throughout the day. It cuts out every few minutes to a couple hours for anywhere between 1-10 minutes at a time. I tried asking my apartment complex and they directed me to the wifi provider. I contacted the wifi provider and they forced a reset. They said the modem is working fine. They said the problem is that the modem and router aren’t connection like they should.

I have tried unplugging and plugging back in. That didn’t help at all. I tried it several times. It’s still faulty and cutting out.