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Hello, in order to isolate the problem- I need to ask you some more questions.
First, when the content goes off the screen for a few moments- are you able to use the original LG remote and pull up the MENU?
Also does the sound continue?
Additionally, "freeze" can mean several things- I need to know if the picture actually freezes on the screen?
Or do you mean the controls have no affect?
What remote are you trying to use that does not work when the screen or controls freeze?
Are you able to see my reply?
This is a fault in the mainboard of the TV- this component processes all AV signals, and also the remote commands. The issues you're having indicate that the processor on the mainboard is failing and the board itself needs to be replaced. If you're looking to do this yourself, then you will purchase the board at the link below for your set: