Internet keeps dropping every few minutes sometimes even seconds.

For last 3 weeks have been having this issue where our internet keeps dropping every now and then, earlier it used to happen like in 3-4 hours. So we called the support the helped us reset the router and everything hoping everything would work it again started dropping the next morning. So we went ahead and changed the router which is the "Technicolor XB6". Even after getting the new router yesterday the internet started dropping and kept on doing it every few seconds. There's no splitter in my apartment and the cable is connected directly to the router. 

I checked the levels and all seemed fine when comparing to the guide available in the forum. There are no uncorrectable error codes at all. I don't know what else to do know. Someone said in one forum that setting the channel for 2.4Ghz to 11 worked well, but it didn't work at all for me. Still dropping. I couldn't even get into my router settings for 2-3 hours, because it kept on disconnecting so much. I have a Gigabit internet plan.

https://imgur.com/a/Ki8RMYk Noise level and power levels

I hope someone can tell me a possible solution, nothing I have tried has seemed to be working for me.