Quote Originally Posted by GoktimusPrime
Have you guys tried squeezing from the hips rather than the groin? When I first tried to transform him to robot mode, I squeezed at the groin, but then I tried again by squeezing the hips and was able to get that sucker to lock in. Once it does lock in, it's pretty tight.

→← = groin; avoid squeezing here
→← = hips; squeeze here
I have this same problem, have tried the advise noted above but seems to be that the hooks that click together on mine are not long enough to hold together.. So just have to be careful while displaying him in robot mode.