Probably due to intermittent breakdown of a component in the power supply or line output/EHT circuits.
32" widescreen TV's often have EHT as high as 32,500 Volts.
So possibly the EHT is arcing, (especially at the final anode connection to the cathode ray tube), which is often due to..
1. Storage of TV in a damp environment. (Leave switched off for several hours to reach room temperature, if fault persists have it checked over thoroughly by an engineer as this can cause corrosion to the EHT connections, making it unsafe and likely to cause other component failure).
2. Transfering the TV from a cold environment into a warm room. ie. condensation. (Leave switched off for several hours to reach room temperature.)
3. Arcing/intermittent short circuit inside the cathode ray tube.
(Requires replacement of the cathode ray tube).
* Possible causes are not limited to the above but those are some common problems.
Best to have it checked over by a qualified person a.s.a.p., to ensure it's electrical safety and prevent other damage.
Also, check your wall socket, plug condition and especially any multi mains adaptors for poor connections.
Cobweb
January 2005