Sony Xperia Z4 slips out of top 5 best sellers in Japan

The Sony Xperia Z4, which was unveiled in Japan back in April and went on sale on June 10, has slipped out of the top five best-selling smartphones ) in the country.

The NTT docomo and au by KDDI variants of the device, which debuted at the number 1 and 2 spots, have slipped down to number 7 and 8, respectively. The top 5 spots are occupied by Apple's iPhones, while the Xperia Z3 Compact is in 6th place.

This shouldn't really come as a surprise, given that almost immediately after the Z4's release, users started complaining about overheating issues. Its international variant, the Xperia Z3+, is also plagued with similar issues. Meanwhile, Sony has promised that it will release an update to fix the problem sometime this summer.

Via