GPS broke after repair.

[SirMacke1]

Sent my Z3c in for repair, the back came loose.

They switched half of the phone for that..

Before I sent it in GPS would lock after 5-10 seconds indoor, and almost directly outdoors.

Now it cannot lock at all indoors and takes 5-10 minutes outdoors.

I have cleared GPS assistance data and so on, but no luck.

What have they done to my phone?

[Thommo]

Sorry to hear this but you would need to either return your device to the place of purchase or contact Xperia care and have your device inspected http://www.sonymobile.com/global-en/support/contact-us/