I own an IFB 30SRC1 Microwave oven.I used to bake cakes regularly in my previous microwave on the convection mode at 180 degrees C for 45 to 50 minutes and they used to bake perfectly.However with my present IFB MWO I have found that my cake browns and bakes perfectly on the top but remains unbaked and uncooked on the inside inspite of using the same temperature and time .Please advise as I have tried time and again with various temperature and time but of no improvement.Thank you ,I hope the response will be quick.