Webview & games crash

used greenify store version and beta 7.

device
htc m7, xelemental kernel, Android 502

affected FIFA 15 Ultimate and general Webview

setting
boost on
app state on
cpu wake on
auto hibernate on

periodically the game just crashes after which entire launcher (sense 7) is scrambled.
must reboot or use shortcut key for ram boost app kill.

originally shipped with webview 37 then updated to 45 problem exists.

tried turning off various options but no luck

only able to use game without any interruption if xposed module is disabled.

any ideas?