I think you're dealing with a compatibility or software issue between Spotify Connect and your MEDION® LIFE P85135 radio. Since you've already tried updating apps, resetting devices, and troubleshooting your network, one possible workaround could be using a different version of Spotify. You might want to try installing Spotify Lite Premium APK, as it offers a more lightweight app experience that might reduce the chances of crashing or conflicts. Alternatively, if the problem is a firmware issue, keep an eye out for updates from Medion, as they may eventually release a fix. You can also check forums and user groups for any unofficial solutions or workarounds.
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