my beko OIF 22100 oven has deveopeda strange fault. The fan? sounds as though it is rumbling intermittently and then the alarm goes off and the oven switches off. It can then be switched on again as normalu until the process happens again. The rumbling noise which sounds like the fan area makes the noise on and off for some time before the oven alarm goes off and the cooker stops. I dont know if the problems are connected. Please can you help?