Yeah, Lollipop has been a mess lately. Lots of people have been complaining of some very serious bugs in Lollipop including that one memory leak bug and a drastic reduction in battery life. I honestly thought that Lollipop would have helped Android by getting rid of the Dalvik Engine and its compile-at-runtime system and replacing it with ART. If you ask me, Android's code quality has recently gone down the toilet. Yes, I know, Apple has had some issues lately as well and I'm not denying that but at least it seems that they have been attempting to fix their mistakes unlike Google Android.
Yes I was excited about ART as well, on paper, sounds great, in real life, the phone performs like a 5 year old pile of garbage. Just try this, launch a few applications, then hit the bottom left icon to show your running apps, when flipping between them, the motion is slow and jerky and makes their almost flagship phone perform like a turtle