My Z5 Premium no longer seems to like smart connect anymore. It no longer changes phone volume at the times I have set even though the message comes up saying it has? Is this an update issue? Will it be solved?
I agree with the recommendation written by @uliwooly above in that you can try clearing the data for the app. Note that this will reset all your current actions which you've set up within the app, so you'll have create these anew.
Should the behaviour persist, could you try to see if the same occurs in safe mode?