Yea, I have the Defender for the S6 and the it was pretty loose inside of the plastic shell. Otterbox is sending me a new shell.
Are you keeping the old one as well? Would be interesting to a/b to see what they have changed or if your original one was defective? Actually if you think about, being loose inside might be to your advantage since you can probably get away with tempered glass screen protector if there is any extra room
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