Some times the dlna devices show “not present” , this happens because the schedule have fail, every 3 min the speaker must to send status but if the timer fails the status is not updated.
Try to use the app watchdog time and add your speakers, theses app will refresh your dlna speakers and avoid schedule fails with the help of a event devices
In next release I’m going to add this watchdog in the MR connect.
But, I have been very busy with my job. be patient.