TV & Home Theater

[Stewartstown]

I recently purchased a 42" LG (42LV4400 LED 1080P 120HZ at the Hunt Valley, MD store that is going out of business.  What I am experiencing is, when watching the volume changes to a lower volume.  Would like to know how to correct this.  I have been all over the settings on this TV and cannot find the fix.  If anyone can help please let me know.

Thanks,

Sue