My internet drops continuously several times a day

I have recently got the xfinity 300 mbps internet service. I am facing this issue several times on daily basis. All of my device lost internet connection. Sometime, I just lost the connection to the internet while sometime all of my devices get disconnected with WiFi. I have tried to troubleshoot several time with Xfinity Assistant through the phone and it restarted my gateway several time but the issue persistently happens. Can someone help me on this please? I tried to call the support but, it is answered by AI and it follows the same steps restarting my gateway.