The Sony Xperia SP (C530X) has already been released in select markets around the world, despite a delay for UK stock which is now expected next week. However, some people are starting to report on a display problem which causes the handset to stop registering touch commands. Strangely, the issue only seems to occur when the handset is placed horizontally on a surface. A few videos below highlight the problem. If you are an Xperia SP owner, we’d be grateful to hear if you’re having similar issues.