Mine stopped connecting after the latest update. Sucks cut I have been putting it off thinking this could happen!!! Android tablet. Core is on my Qnap NAS.
Hey @Patrick_Engel and welcome to the Roon community 
I’m so sorry we missed your post for this long. To make sure we can help properly — if this is still an issue — would you please use this article as a guide to share some information about your setup and the connectivity issue you mentioned?
Even if this delayed, we’d love to help. I am so sorry it took us this long 