Keep losing signal

Check the signal level and quality. Reseat all aerial connections.

do you lose the audio signal when this happens ?

It is the signal from the 4 local stations that is the problem, because you can record all others ok. Borrow another VCR and try to record them, if its the same tell the people who run the local channels that they are losing viewing figures, because their channels cannot be recorded.

Not familiar with your model, but the problem sounds generic. I am guessing your set is hooked to a cable tv box, and that is where you need to change channels. I also guess that when you changed channels on your TV you probably moved from channel 3 to either channel 2 or 4 and the cable tv box is not sending to those channels so you lose picture and sound. Now, more guessing, you try to put the channel back to 3 on your TV, but still nothing happens. OK, if close so far, there are a couple of things to try. First, be really sure you are actually going back to the same channel you started with. Assuming you don't actually have the signal coming in on an auxiliary line-in and that you had it coming in on a channel, you may need to reset the presets on the television so that it recognizes the one important channel the cable tv box is sending out -- just follow your television menu to select or set channels. There is one more possible easy problem ... I have seen this one happen, after getting the channel correct and reset, if it still doesn't work, you mght need to turn the set off and wait one minute, then turn it back on WHILE the cable box is ON. This can cause the set to RE-Latch onto the cable box signal. It really doesn't sound like something is truly broken or needs replacement, sounds more like a user error. If your set is still under warranty, just call the Panasonic hotline (find it in Google, and they may be able to walk you through exact instructions for your model). Hope this helps.

Some philips tv's have a built in aerial amplifier, perhaps if you bought a digital aerial booster it will improve the picture quality.

switched HDMI plug from HDMI1 to HDMI2 port and that solved the problem

When you say you "lose" channels, you probably mean there's no signal there anymore but they are still in the channel memory. This is normal if you have a rotatable antenna. You need to mark the rotator (or just keep a chart nearby) with the heading for each channel.

If you mean you're losing channels from memory when rescanning after turning the antenna, the only solution I can offer is to record the channels found (and their signal levels) after scanning a direction. Then change directions and rescan. See what new channels have been found, what have been lost, or how signal level has changed on common channels. Then you can manually add whatever you need, and you'll know what direction is best for each. It's tedious, but you should only need to do it once.

What brand of tv is it ? You could have a bad tuner or a change in the voltage supply line feeding the tuner . What type of antenna do you have ? outdoor or rabbit ears ? Also does it retain the channel line up or does it clear them as well ?

To fix the problem, try turning off the TV and unplugging it from the outlet. Once unplugged, push the power button and hold it down for 1 minute. Then turn the TV back on and rescan for channels.

If the problem persists, contact LG customer service immediately as there is a problem with the memory card. The device is unable to retain scanned channels for immediate feedback.

All LG LCD automatically comes with a 1 year manufacturing warranty. You would have to provide proof of purchase to show when it was purchased. Hope this helps. The Guru

LG customer service: http://www.lg.com/us/support/index.jsp

You need to press the button on the top right of the control ( the TV button) once and that will allow you to control the tv once again. Problem occurs when you accidently push VCR or DVD button which means remote control will try a different frequency to operate a VCR or DVD that isn't there. Hope this helps.