Razer Phone 2 Wi-fi issues on android pie

So, last week I bought the Razer Phone 2, everything was working just fine until I updated it to the Android pie. My wifi stopped working properly. It would load some internet pages, a few apps, like Whatsapp, google play, and some games, but Netflix, Facebook, Instagram, Youtube and a lot of other apps failed to work over wifi. I tried to fix through DNS configuration, Factory reset but neither solved my problem. I was only able to test it on two wifis, both were 2.4GHz. Then I installed a VPN app and to my surprise, it worked. I don't want to keep using a VPN every time that I want to use my home or work wifi, so today I went back to the store and they replace my phone for a new one and once again, I have the exact same issue with this new one. Has anyone encountered the same issue before? Is there any way to fix it? Thanks in advance.