check the switch, clean it, check if there is power. The clicking could be overload, check wiring diagrams. On the German forum I read that some had to repair the control module.
Is it working when te,peratures are colder or warmer? Because that could have an influence on the power rquirement for the motor. The electric sunblind has no limit switch, it switches off when the amp rises and with some seconds delay. If temp is warm, material expands and that could cause more power requirement, or the other way round.