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It should only do this after it has lost power and then regained power. Are you unplugging the device in between uses or using a surge protector/power strip switch to turn off the power between uses?
It is just a reminder to new users that they should refer to the manual. It is not reporting that there is anything amiss with the device. Panasonic NN C994S Operating Instructions Manual Let Start To Use Your Oven
I can't tell without more exploration what may be the cause, but 1st let's start fresh. Reset the MW by unplugging and replugging the unit. Then set up the clock, etc by following the manual. For reference, go to http://www.emersonradio.com/resources/owner_manuals/manual_1313021007.pdf for instructions. There are many interlock micro-switches that must all work when the door is closed. Take one step at a time, then come back.
Inside the door latch, is a safety feature, that prevents the microwave from operating unless the door is closed. This feature can easily become faulty, or even come with the fault already causing the microwave to constantly operate whenever the door is closed.
Microwaves can be very dangerous in regard to holding HEAPS of voltage within the unit. I recommend getting yourself a new microwave, as attempting repairs on any of the modern units can, more often than not, be far more costly then the price of a new one.
If you have warranty use it asp, from the description the problem is in the keypad "membrane shorting" or the microprocessor control board is becoming intermittent, it will get to the point and stop functioning.
Did it show an error code in the display? If it showed H-98 or similar the magnetron has failed. It is not a customer repairable item. Take it or have an Authorised Panasonic service centre look at it.