Happens to mine as well (DAV-FC7). I looked around a good bit, and found that there is a fault tranistor of the DAV-FC7/8/9. This causes the unit to overheat. I'm guessing that if your's is going to standby instead of turning off, the DVD player is also becoming unresponsive during films. This is all because of overheating of this transistor. If you buy a couple of heat sinks, attach them to the bottom, it should fix the problem. It should be about 20 bucks online. If you send it to Sony to repair, it will be about 200 bucks.
Hope this helps!!!
Bobby
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