(cheers) Heya
I have a Mazda Tip bulletin for this issue. You can reference M-TIPS.
Quote
Water may accumulate and freeze in the latch mechanism for either of the rear side slideing doors. The ice guilduup may interfere with the levers of the latch mechanism, not allowing the sliding doors to latch closed.
Fix
A temporary fix has been developed to address this issue. Basically they remove the sliding door panels and at the latch cover a hole with tape and then with a special grease fill the latch etc etc more stuff. This grease prevents ice build up.
At the end of the day this will temporary fix the issue and a replacement latch is on its way.
I have experienced the freeze and used a hairdryer to move forward then got the above fix done with no issues after.
Cheers
Zoom5Zoom