A while back I noticed a bunch of problems with the Sony Xperia Z Premium. First, one of the external speakers stopped working — put simply, only one speaker produced sound. I also found yellow spots along the edge of the screen, maybe a screen issue. Since mine was a China-market unit, I went to Sony after-sales service. This time the Sony service location had moved to the Erqi Square area of Zhengzhou, on Dehua Street. I don’t think I’ve been here in ages… it’s changed quite a bit.