How do you know if the oven wants repairs or it's time to buy a unknown oven? I know the question seem like I've answered it myself but here...

I know the question seem like I've answered it myself but here is my situation.
My oven have worked as expected in times past. I set the temperature, put contained by the food for the reasonable amount of time, and the food comes out cooked.
Lately I hold been putting contained by the same foods (i.e. banana bread) and they are not cooking on the inside. The bread is still batter and the outside is burned.
Do I call for a repair man or chuck out the oven and start anew?
I don't want to spend money on repairs if I new oven is what I requirement. The age of the oven-6 years.

Thanks
Home Heating System Quit Working?
Answers:    The oven should last longer than 6 years, but entity wear out or break sometimes quicker than they should. The best answer I can give is how much is the oven worth and how much would it cost to replace? From experience, most of the time it will cost almost alike to fix as replace. But it could be something simple, and from what you said I would believe it is something simple. You can always appointment the repairman and then variety your decision.
Good luck contained by whatever you settle on.
What could be cause blue mould contained by...
It needs a up to date thermostat,cheap part.