Le potato wont play acc files after playing other formats

  Hi everyone,
    I've just installed Coreelec on a Le Potato and have encountered a strange problem.I've looked at the forums and can't find a entry quite like this one.
    Like I said ,I installed Coreelec on a Le potato and set it up like my Libreelec setup in a RP4.I connected a usb drive with various media on it.I first played a video  with acc 2.0 audio and it played fine.Then I played a vid with dolby atmos, and then another with dts audio and everything was great. Then I played another  video with acc sound and got no sound.I looked everything over in settings and restarted kodi.I played a acc video, it played fine. I played another acc video which also played fine. Then I played a dts video,again played great.But when I played a acc video,no sound.
    If I play acc videos after starting/restarting Kodi,They play fine.But if I play a video with another sound format,and then try to play a video with acc sound the video plays with no sound.Has anyone else had this problem? Does anyone have an idea what the problem might be? 
                                           Thanks in advance

Sorry,I meant to say “restarted the whole system” if I just restart Kodi,the problem will persist. I have to reboot the computer.