Frequent internet connectivity issue

Hello,

I have been struggling with my internet since last few days. Ever since I switched to xFi gateway, situation has become infinitely worse. I am restarting my modem every few hours and then it takes long time to stabilize. So far I have tried following things

- Changed the Xfi gateway to new xFi gateway.

- Changed coaxial cable from my wall outlet to modem.

- Comcast technician replaced splitter outside home and wall plate inside home.

- Put xfi gateway in bridge mode and used Asus gigabit router.

- Disconnected everything from router except my laptop and TV.

Even after this, I still have same issues. Every few hours, I am left without internet.

When my xfi gateway was not in bridge mode, I saw these firewall log messages just before internet connectivity issue

FW.IPv6 INPUT drop , 1641 Attempts, 2023/6/19 21:21:27 Firewall Blocked

FW.IPv6 FORWARD drop , 1127 Attempts, 2023/6/19 21:21:27 Firewall Blocked

Any help on this is much appreciated.