I would like to report the issue and ask help on my internet.
From last week till now, my internet always work well in the morning, but it will become very unstable during night time. It keep changing between "connect to the internet" and "no connection to internet" every few mins. I try to power off/on the router again and again, but it don't solve the problem. I also try to connect to computer directly by cable instead of using wifi, but the connect/disconnect problem is still there. Do anyone also suffer the same issue recently? Any idea why?