Auto Reply while driving

[16FW]

My Z3 is sending an auto reply saying "I'm driving right now - I'll get back to you later". The problem is it does that when I am sitting on my sofa. I like it to auto reply when I am actually driving, but not when I am home. How can I fix that?

Thanks
16FW

 

[16FW]

I *think* I have fixed now. I restarted my phone, and the next message didn't auto-reply.