intermittent fault with the motor/compressor.the clicking you are hearing is a sign of the motor not starting.as the temperature rises the thermostat tells the motor to start,if the motor doesn't start the thermostat will keep sending a signel to the motor at regular intervals untill the motor starts.the clicking you are hearing is this process,this is my initial feeling,however I would also investigate the thermostat/pcb operation and also the defrost evap circuit.this is something you cannot do at home,you are going to need a engineer to address this problem.a motor replacement and coolant/recharge wouldn't be cost affective.I wouldn't condem the appliance without making the above checks.carry on running the appliance untill the motor totally fails and buy a replacement fridge/freezer.don't worry the appliance is not in a dangerous state ,try and stay away from beko,.
mr freeze, December 2011