We had the same issue. Unplug your tv and press the on/off button on the tv, hold it in for 10 seconds while the tv is unplugged. Then wait 20 seconds more and plug the tv back in and turn it back on. This solved the problem for us.
This solution worked for me as well. Really thankful to you.
this app will now restart to free up more memory
in LG webOS Smart TV Questions
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This solution worked for me as well. Really thankful to you.