Cooked up a small systemd service to automatically restart the Kodi service on resume from sleep. In case anyone needs it:
CoreELEC-BDR:~ # cat /storage/.config/system.d/onresume.service
[Unit]
Description=Restart Kodi after resume
After=suspend.target
[Service]
Type=simple
ExecStart=/bin/systemctl --no-block restart kodi.service
# ExecStart=/usr/bin/systemctl --no-block restart kodi.service
[Install]
WantedBy=suspend.target
CoreELEC-BDR:~ # systemctl enable onresume.service;systemctl start onresume.service