Westinghouse WVE617S Questions & Answers

I bought a WVEP617 oven 4 months ago. It has been working fine for about 3 months and It now displays F135 often and often the oven doesn't work at all, the lock is often coming on and off by itself and often not allowing the door to open or if it is open not allowing it to close, the clock looses about 4 mins each day, and to select a temperature and turn on the oven is sporatic. Any idea? Mark

I bake bread regularly, was hoping this oven would be perfect for bread baking. However I have not yet found appropriate function setting for bread or biscuits. Whenever I bake it takes much longer to bake than recommended time in the recipe. Please help me sort bread function and biscuit function to perfection.

The oven shows the clock sign all the time and does not heat, I believe it is in demo mode, how do I get the WVE617 model out of demo mode?