This issue happens to me too. Sling is set to my "Watch TV" input option and if it's chosen it's like herpes - you can't get rid of it. The only thing that works is to quickly choose any other app when you press the home button and have 2 seconds to do this.
I actually think it's an LG issue because as someone else said I entered the same kind of loop one other time with the antenna channels.
Enter Home Button from Sling TV app, but Sling TV immediately Re-starts
in LG webOS Smart TV Questions
Posted
This issue happens to me too. Sling is set to my "Watch TV" input option and if it's chosen it's like herpes - you can't get rid of it. The only thing that works is to quickly choose any other app when you press the home button and have 2 seconds to do this.
I actually think it's an LG issue because as someone else said I entered the same kind of loop one other time with the antenna channels.