If you have problems outside the warranty period, just go back to the retailer.
In most jurisdictions a "Consumer Durable" such as a computer should be Durable -- and that means much more than 12 months under most consumer laws.
As for LG vs Samsung -- both are large bland and arrogant Korean corporations. Of the two Samsung have a better take on the consumer market and seem to be on a roll technically at the moment.
You might take up your issues with the Samsung staff who work the CNET forum dedicated to their products -- if you raise enough stink there you might embarrass them.