Gramofon regularly stopping Radios

[Yrzmyrz]

Hi, actually I am quite happy with my Gramofon except when it comes to playing Radios. After a while, usually between 30 and 90 minutes of playing it just stops. Restarting a radio or playlist first doesn't result in any sound, you first have to add an action (skip forward or backward), then it runs again. Playlists are running for ages if they are long enough, this only happens to Radios.

In case of relevance, devices used to start/control the Gramofon are Iphones and Ipads.