Oven is a Whirlpool Model # WFG371LVB1 Serial # R00415666 and is about 10 years old.
When cooking for less than 20 minutes, there is no issue and the oven will stay heating for the entire time. But anything past 20 minutes and it will eventually stop heating. The oven is still on and displays the set temperature (example 425 degrees).
You can hear it clicking and trying to turn back on, just like when you initially turn on the oven and it starts heating. However, it eventually clicks off and no longer heats.
I'm not a handy man and will need to hire someone who can fix the problem. But just wanted to see if anyone could possibly identify the problem and give me an idea of what it will cost to repair the oven.