Not able to connect to the router after some time

[skaxelfr]

Hello, i'm struggling with wifi-repeater since a few days, i'm using raspberry pi 4 with a TP-link Wn722n wifi adapter. So when i set the device up, it's working fine but after a few hours, the repeater has no more access to the internet and the logs says Warning: "Could not detect internet access. Bad WiFi credentials provided or WiFi network has no internet access..." but when i connect to the router directly it's working fine. Any idea how i can fix that? thanks