Connected to wifi, but no internet access

first question here. I was using wifi normally on my phone. Then I turned it off and after some time turned it back again. Since then I can not access the internet. It's showing Connected(no internet access). I tried to set the IP static. It did not work for DNS 192.168.200.1. No matter what IP I set with this DNS it does not work. Then used the 8.8.8.8 as DNS, now it's connected. But it is really slow, and the connection does not seem stable. Every time I have to reload google.com several times just to get the page. The problem is specific to this device only. Other devices connected to the same network are perfect. I tried - Restarting the router - Resetting network settings - Clearing network cache from maintenance mode - Rebooting the device with and without airplane mode My phone is Huawei Y9 2018 with Android 9. Can someone suggest me what should I do? Is this a router issue? Or is this my device problem? I'm new in this area. So my knowledge is not so deep and you might have to explain things a bit more in detail for me to grasp the concept.