Why can’t I reach a Raspberry Pi host on LAN after period of time from a Windows 10 desktop?

I have a Raspberry Pi running as a home server, hosting several services (local DNS, Vaultwarden etc…) and from the startup everything works fine

But after like 5-7 hours I’m not able to reach this host from my Windows 10 desktop. And the thing is that network seem to work fine, I can ping server from other devices on same network, and I can ping other devices from Raspberry Pi, including said Windows 10 desktop.

So I’m at a loss here, I don’t even know where to start debugging this. Reconnecting the Raspberry Pi to the Wi-Fi fixes it temporarily for another 5-7 hours.

Maybe someone has encountered something like this and knows how to fix it?