music playing slow in background

Hi guys,
I have Kodi 17 installed on a new Joying car head unit running Android 5.1.1 with a fast processor & 2GB of RAM. It runs perfectly in the foreground with lots of apps running. But once I open any app (particularly Google Maps) Kodi runs in the background & the music playback runs slow & choppy. I run google maps all the time & want to run Kodi for music.
Also I tested 3 other music apps running them in the background & the playback is fine, its only Kodi that runs slow. I would go to another music app but I really want the option to remotely control the music, plus I really like Kodi.
I hope someone can help.