Oven shuts off while baking will not come back on until it cools off

SOURCE: preheat worksoven wont bake

hi The range timer is usually located in the control panel on top of the range. If you suspect the timer is faulty, don't try to fix it yourself. Remove it and take it to a professional service person for testing. Here's how to remove the timer:

Step 1: Remove the back service panel to the control panel and release the spring clips that hold it in position, or remove the retaining screws.

Step 2: Push the timer forward to release it.

Step 3: Remove the electrical lead wires from the timer housing. If, when disassembling the timer, you notice that the electrical wire terminals look burned, remove these leads and buff the leads and the terminal points with fine steel wool. Burned and/or dirty terminals can cause the timer to malfunction, but a good cleaning can solve this problem.

Step 4: Replace the old timer or install a new one of the same size and type, if this is necessary. Connect the new timer the same way the old one was connected.

SOURCE: How to set the temperature on the KitchenAid Superba oven/convect

A separate oven thermometer is absolutely necessary in baking. Something similar to this would be cheap and easy. http://www.bedbathandbeyond.com/product.asp?order_num=-1&SKU=10161738

Or you could go for a digital one with a probe.

SOURCE: Why does the oven cool down during cooking. This

seems like the thermostat needs replacing, also make sure any programming mode, mechanical or digital is off

SOURCE: i think the oven is not getting hot enough,i have baked three

Buy an oven thermometer to check if the temperature you set the oven at is accurate. You may have a faulty thermostat, but if the temp is only off by a little, you can calibrate the temp setting on the oven by as much as + or - 25 degrees. If you have an LCD screen, then most likely you can adjust it right on there. If not, then the backside of the oven knob can be adjusted + or -. by moving a set screw and turning as needed. Your owner's manual will have a more detailed explanation on this procedure. Douglas

SOURCE: When set to bake eg: 350 degrees the audio alarm

If you are monitoring the oven temperature with an analog style thermometer you may actually be ok, but seeing the thermometers slow reaction time.
Some newer ovens actually do pre-heat beep prior to reaching temp in an effort to conserve eelectricity.
A good home test is to try your oven at several different temps to see if there is any variation in internal temperature. Try it one day on 300, the next at 375 and another day at 450. Give your analog style thermometer time to catch up (usually just about 15 min) and leave it on for a half an hour to see if the temp maintains.
Also Beware of aluminum foil AND THE NEW OVEN LINER MATS as they can alter oven performance bay absorbing and blocking the ovens natural heat radiation and convection air flow currents that happen in all ovens, not just convection models.
Another interesting fact is that older ovens used a thermostat in them that operated much like your thermometer and was very slow to react making the oven typically about 100 degrees hotter than where the customer set it. This was just a fact of life before the advent of electronic temperature management and became noticeable when people began trying to bake older "hand me down" recipes in the newer ovens with less than stellar results.
You can mimic the older oven performance by preheating the oven about a hundred degrees higher than called for and after it reaches temp, re-set it to the correct temperature and put the items in right away.
If you find your temperatures fluctuating ask your servicer to replace first the temp sensor and as a last resort the control board as this part is usually pretty expensive.
Good Luck with this!