Songs cut out for a second or two then resume also songs sometimes speed up

[Ian004]

When listening to songs - both streaming and offline (downloaded) - on bluetooth the songs occasionally cut out for a second or so and then resume - they also speed up for a couple seconds and then play normally - there doesn't seem to be a pattern to the problems.

I have re-installed, cleared the cache, tried differnet blue tooth speakers.   This wasn't happening a month or so ago.

Have tried with app and music on my SD card and also with everything on internal memory.  Same problem.

Im using a Samsung S7edge+ - android 6.0.1

I have spotify premium - app version 8.2.0.788 armV7

 Thanks