Why do SSH and GUI access stop working after a few days?

I'm new to Proxmox and recently set it up on my homelab. Everything works fine but SSH and GUI access stop working after a few days. Rebooting the computer fixes it but after a few days, SSH and gui access (https://192.168.1.5:8006/) does not work again. Can someone guide me on what configurations I should check and update?
thanks much in advance!