Many other users expierence the same issue, inclusing myself. Already since I bought the ZF8 last August, but indeed, the issue seemed to have increased with the latest build. My ZF went to repair three times for this, but Asus 'could not duplicate the issue'. Although the issue is very clear, they will request you for screenshots of the issue, a log file etcetera. And with those they can't solve the issue anyway, so save yourself the hassle.
I experience a drain of 12%-15% with screen on, light use. But as soon the camera is used, streaming video or even scrolling thru Spotify playlists of Instagram feeds, the drop rises to 20% easily. This ZF8 can be used in and around the house when you've your charger at hand, but I already have another phone for daily use. The ZF8 is there for extra or to grab it when the other is charging. A shame. Good form factor, but it is very energy inefficient and the motherboard tends to fry around the two years point, mostly just when warranty has expired. So be aware to backup your data constantly as it might die on you unnoticed.
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