Sony Xperia Z1

I ha en a Sony Xperia Z1. This phone must be less than two years old and I have had so many problems with it! First of all, out of the blue the back light decided it no longer wanted to work and Vodacom said they could not fix it. Then it fixed it self after being switched off for a week. After about two weeks of functioning normally it decided it didn't want to work and i had to be taken in to get fixed. Yesterday I wiped it with some water (it is waterproof) and now it no longer works! Worst phone have ever had