Last update to Muzecast was on March 30th. If this started to happen right after an update, I would have to take a look if any errors were sent. Also you can check Error Log in Muzecast app: Muzecast Settings->About->Error Log.

If this started to happen way after Muzecast update, then it might be outside factors which might be as follows:
1. Connection to your headset is getting interrupted, which causing Android to send a signal something like: ACTION_AUDIO_BECOMING_NOISY - meaning headset or Bluetooth headset is unplugged. Muzecast will pause playback during that signal to avoid laud music playback on a speaker (per Google guidelines);
2. Bluetooth connection dropped, which would cause the same signal been sent;
3. Another app, which you might installed lately, sending this signal occasionally.

If you see something in error log, please let me know, or send a screenshot.

I also might suspect Doze Mode might getting kicked in (if you are using Android 6 and above). In that case you should place Muzecast in Whitelist of apps to prevent from getting optimized. That setting should be in Battery settings of Android. I cannot force Muzecast to be automatically placed in Doze whitelist. Google does not allow it with penalty of removing app from the store.

I have been testing it with just the speaker on the phone and on Wifi. I have the screen set to remain ON during playback and have the phone next to me on my desk while it is playing. Yes, it pauses in the middle of the song, I press play and it starts again. This is a pause, because the 'play' button appears with the arrow.

Now it ALSO sometime stops at the at the end of song and never goes to the next one. I can swipe and the next song starts, but this is becoming worse. The now playing screen acts like it is still playing the song, but it's at the end of the song and never advances.

It doesn't do it on every song, sometimes it will play a few songs before it happens.

It may have something to do with Android 7? It seems that things like this happen every time there is an update to Android. I have not installed any apps that would affect it.

The app has become unusable for me now and I have been using it for years. Over 1.5 years on this phone I have now and several on my old phone.

Should I uninstall the app and re-install?

What will happen to all of my downloaded songs if I do this?

Is there a cache cleanup or something similar I can do?

Sound Quality settings are Optimal on both Mobile and Wifi.

Exoplayer is ON

When ExoPlayer is turned ON, streaming is done using MP3 VBR. The current version of Muzecast Streaming server creates MP3 VBR file, which ExoPlayer might not read correctly.
Information, such as duration of the song. ExoPlayer depends on device codec and some devices, just cannot properly handle MP3 VBR file without VBR header.

Upcoming version of Muzecast Streaming server is going to create complete VBR MP3 file with header (initial song playback might be delayed by a couple of seconds because of this). In that case any player will be able to handle it properly.

When ExoPlayer is turned OFF, streaming is performed using OGG format. That format has no issues with VBR and any player can handle it properly.

Now I assume that was the main reason, why playback was stopping on your device.

Pointers to these files are stored in Muzecast local to device database. Copying files will not help.

Do not yet try to uninstall the app.

Are you using official Google Android or Lineage OS?

If Lineage OS, I will try to reproduce that issue on this OS on one of my devices to see if it is OS specific.

This week I am going to publish updates to both Server and Player. After that, let's see, if problem still exists. I did some adjustments to Audio Focus as well as VBR headers for MP3. These 2 fixes might help with that problem. I am just guessing, because I was not yet able to reproduce the issue you are having.

Latest releases of Server and Player/Streamer are posted.

It is posted on Amazon too. Amazon store might delay rolling it out. Usually app becomes available after about 2 days on Amazon store once it was updated. I just check the store and it shows latest version 7.1.4. You could go and try to download it.

You can try https://download.lineageos.org/shamu

I was suspecting that there might something in Android, and yes Google rolled back 7.1.1 for Nexus 6. Let me know how it goes. For now all test devices and emulators for each and every version are passing for Muzecast. That is why sometimes testing might take several days, because I am running multiple devices 24/7 for several days to make sure playback goes without a hitch.

Pushing update, which fixes random pauses of skipping song in the middle of playback on some devices.

Not sure what do you mean about Smartwatch?

Do you have issues with playback on your Galaxy S7?