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See if this helps:
/t5/Xperia-S-SL-acro-S/Xperia-Acro-S-sends-sms-on-restart/m-p/589263#M37746
It does not... They suggest there that the problem could be multiple sms apps but i only have 1, the one that came with the phone. I also have google hangouts but that is also an app that came with the phone, so it would surprise me if the problem has something to do with those 2 apps not working together.
Yes I am.
The issue could be that you are using both hangouts to send regular SMS and if you don't have the data on, they might be sent when you do have data or wifi.
This occured to me in the past on Z1,but I think it is related to the network more than to the phone.
Strange but it didn't occur on my Z1 on a regular basis. I still don't know what could trigger this behaviour.