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If you switch your tv of at the plug the software cant do the updates. Leave the tv in standby over night and that should work. If you do leave it on standby but still losing channels contact goodmans as you may need an update of the software
99.9% chance its the power supply. If you have basic electronic knowledge you could repair it yourself for a few dollars, send it to be repaired for around $100, or check Ebay or the parts houses for a replacement for between $30-200. I just bought a new supply for an Insignia 37" from Best-Buy Parts for $34 when everyone else wanted $99--179. Do some research and make you own decision. Let me know if I can help further. CC
tv goes into standby all the time if a power supply is not fine, what happens is that a power supply produces two voltages, one small one powers a standby components and bigger voltage powers a line transformer which later produces more small voltages,
then later cancels the first small voltage.
chec your power supply semi conductors like, transistors, diodes and small value resistors, on your power supply. some power supply uses a IC to oscillate a ht. so check a supply at a w/shop.
If you can not turn on TV set with the power button on the TV its not a standby problem as this would by pass the standby. Theres most likly, on a set of this age, top have a poiwer regulator problem and is going to need a trained tech to assist you in this repair.