Hello, we picked up our icandy cherry yesterday - very pleased with it, BUT only when home discovered that secondary lock on handle doesn't automatically click into place when we put the chassis up, so can collapse it simply by pressing the big grey button. We can 'make' it work by pressing big grey button in, then pressing secondary lock up, but should we have to do this? Thought it was supposed to be antomatic? Hope this makes sense! Any thoughts? Do we take it back or do you all have to do this too?