Why did you not try to get it fixed a year ago? LG was actually being quite good about repairs. They stated that they had extended everyone's warranty to 15 months, AND they were even more generous with most. My brother got his fixed at about the 18 month mark.
Ok I looked up and have more info for you. There IS a suit, BUT also it appears LG has extended the warranty AGAIN to 30 months, which SHOULD cover you....
Rooting will definitely void any warranty you may have. It's the reason I stopped rooting my phones. Really the only thing I miss is using Titanium Backup to save my app data. Most of the reasons I used to root for are available stock now.