My Philips 50 in 4K Ultra HD HDMI will show on the screen " Your Auto TV shut off in a few minutes" to keep my TV on, I have to turn up or down the volumn. How do I turn off the "Auto Shut Off?"

All ovens take a long time to cool, if that is your question.

Try shutting power off to it for a few minutes, to make it easier just go to your breaker panel and flip off the breaker for the oven, wait a few minutes then flip it back on. Unless there is a button thats stuck down, which isn't very common on these due to the membrane type keypad they use, a power cycle to it should clear out whatever is wrong unless its another problem.

The door latch will open after the shut down, therefore go to the home circuit breakers and shut off the power to the oven. Wait a few minutes and try to open the door. If still locked, reset the power to the on position and see if the oven rest and shut down properly and the door lock released.

Likely you need a thermal cutoff replaced near where your heating elements are. It senses the fault and shuts down. You can but an after market thermal cutoff from most any electronic parts supply, and maybe even from an appliance parts supply.

set clock to manual cooking not auto or time

Press Clear/Off to stop the beeping... then press clear/off again. If it doesn't unlock - wait about 15 minutes for it to cool down.

The F1 error means the EOC (Electronic Oven Control) board has a failure - and thought there was a run-away temperature condition.

It should allow itself to unlock after a few minutes of cool-down.

For additional help in finding a replacement part - a Model # will be required.

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due to safety feature you should have oven door closed,turn dial to 1,ignite then turn to 5or 6 hold it in for a few seconds and release.this should solve your problem

it is reaching the correct temperature and then switches back on when cools a bit?

My mother-in-law's oven was doing the same thing. At first it was actually turning completely off which led me to think it was a loose connection on the circuit board. That turned out to be exactly what it was. I had to dismantle the front of the oven, remove the circuit board, and resolder the connections. The first time I did this I must have missed a few bad joints and that's when it started doing what you described (shuting off and showing lock door). I pulled it back apart and found a few more bad solder joints which I fixed; so far so good. This is of course one of those "don't try this at home" fixes but it least lets you know what is causing the problem.