Expiring Letsencrypt certificates and using spice for VDI

I'm testing proxmox for VDI services and using a letsencrypt certificate for the hosts. Most of it works fine, one of the annoying problems is that the LE certificates expires every 3 month which means that the VM needs to be rebooted (stopped and started) to load the new certificates. Which could be a problem if you don't know when the clients are working.

Is there any solution for this?

thanks