You can give it a try by unplugging the tv for at least 2 minutes.
Depending on brown outs and dirty power, It may be that your tv has a glitch within its internal settings.
All newer A/V components are on while plugged in (standby mode). Thus allowing some corruption to happen with how the circuitry operates.
The only way to clear out the corruption without doing a full reset and loosing your settings, is to unplug to power down.
Yes, my 2010 Panasonic 42C2 performs better than an S2 No floating blacks and keeps the lowest black levels.