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Hi @Momma196650,
Do you mean that when you start the Camera application your phone reboots? When did this start happening? Was it after something was done to your phone or after installing something on it?
As mentioned above, does the same thing happen while in safe mode? I would also suggest that you clear data for the Camera application under Settings > Apps > All > Camera > Clear data.
@Momma196650, in that case I recommend that you try a software repair using Xperia Companion. Keep me posted on how it turns out.