Hi senorkulo, welcome to Volumio. 
Firstly, I don’t use Spotify for podcasts, but are you talking about the Spotify or Spotify Connect plugin? What happens when you try to play a podcast?
In terms of restarting Volumio on a regular basis, you can either use cron to run a script at a set time, or use systemd timers (have a Google) … alternatively, there is a thread here.