Ubuntu 22.04 Wifi/Cable keeps geting random disconections and reconections every 5 minutes or so

Im new to this OS, but Im heaving a severe headache trying to fix this wifi/lan cable conectivity issue. Im using a lenovo laptop, with a ethernet card realtek PXE B08 D00 and the internet keeps conecting and disconecting every single time with 5 minutes interval. I tried deactivating the IPv6 since I read here that causes trouble with old ethernet cards, didnt work. I also tried doing this -sudo apt remove network-manager-gnome network-manager-, didnt work either even more I had to reboot the whole OS because I had no internet no matter what I do. I dont know what else to do, I read somewhere here that you could set as static IP as a possible solution, havent tried that but its for ubuntu 18.04, so I dont know if that will work either. Help pls

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