Appliance Repair Questions? Ask a Technician for Answers ASAP
I assume your using the remote to control the TV, in this case can you try and use new batteries in the remote and see if this resolves the issue, you may find they are starting to go and therefor causing intermittent issues.
Please let me know how you get on.
Please give me a while to look up the tech specs for your model, it sounds like a hardware fault but before suggesting you take it to a repair centre want to check what troubleshooting we can do to rule out anything you can do to resolve it.