[Bug Watch] A memory leak that has plagued some Android 5.0 users since the first developer preview has finally been marked closed and 'FutureRelease' in the Android issue tracker today.
Android (or any other operating system for that matter) allocates memory to apps when needed, then reclaims it once an app is closed or is left idle for too long. On Android 5.0.1, the OS is failing to free up RAM like it normally does and is using up to 1.5GB of RAM for no reason.