If you're rooting for Sony to pull through recent tough times, it's still a cliffhanger, according to its latest earnings report. On the plus side, PS4 sales have been stellar, up 83 percent over last year at 310 billion yen ($2.8 billion). The good news drops off sharply from there, however, especially with mobile. Though sales in that division were up slightly from last year, it managed to lose 172 billion yen ($1.5 billion). Since most of Sony's other divisions fared okay, that means its 86 billion yen ($770 million) operating loss can be directly chalked up to its mobile division. Though it warned investors that smartphone sales would be dismal, Sony decided nevertheless decided to fire its mobile division's CEO, Kunimasa Suzuki, and replace him with VP Hiroki Totoki.