More info is needed.
1. AC1200 is a speed, not a model. What model is it?
2. Is the wifi dropping or is the internet not working? What I mean by this are devices showing as connected but no internet connection or are they dropping off the wifi entirely? A better explaination of what's going on helps.
3. If its a cable modem/router combo device please include a screen snip of your connections page and your logs?
4. Firmware on it?
5. Isp you're using?
6. Is it all devices (both wired and wireless), just wireless, or just a single device?
Anymore you can expand can help us to help you. We struggle to help with minimal info.
