Maybe an issue with Steam? Along with Armenius, I've never had an issue as far as game stability.
That said, ever since their performance patch, World Bosses are unplayable, but that's on their end, not mine. I lost one well geared character from that (I play HC). Not fun watching your character stand in the World Bosses death lasers while they're not responding. I know a lot of people have complained since the performance patch, whereas nobody knows who was complaining before. But I guess Blizzard only stated it was a performance patch, and never made the claim that it would actually improve performance.
That said, ever since their performance patch, World Bosses are unplayable, but that's on their end, not mine. I lost one well geared character from that (I play HC). Not fun watching your character stand in the World Bosses death lasers while they're not responding. I know a lot of people have complained since the performance patch, whereas nobody knows who was complaining before. But I guess Blizzard only stated it was a performance patch, and never made the claim that it would actually improve performance.