LG rolled out the Android 5.0

LG rolled out the Android 5.0 Lollipop update for
 the G2 smartphone in South Korea back in
mid-January. After a long wait, the Indian owners
 of G2 finally get a word on Lollipop update -
expect it in Q2 of 2015. @i_Gujju Hi, the Lollipop
 update for #LGG2 is expected in Q2' 2015.

Stay tuned!— LG India
LGIndiaTweets March 19, 2015 LG India's Twitter
 account revealed that the G2 owners will get the
 Android 5.0 Lollipop update in the second quarter
of 2015 - between April and June. This will be a major
 update from the current KitKat and hence we recommend
 to backup your data, perform a factory reset and then
 download the Lollipop update over a Wi-Fi connection.
LG had released the Lollipop update for the G3 in India
but the performance of the update is not that exemplary.

Quite possible that the Android 5.0's memory leak bug
 is causing that and is expected to be fixed with the
Android 5.1 Lollipop