google talkback sometimes prevents 'home' and 'back' keys from their functions

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android version: 4.4.2
device model: Samsung s5 mini
interface local language: deutsch
talkback version: up-to-date
update source: google play
1- after working with android and opening and closing windows for approximately 
ten times, I cannot close the window by pressing back key.
2- at the condition of "1-", I cannot open a new window on launcher by pressing 
'home' key. pressing 'home' key will show a dialog asking for default app for 
doing a search or maybe opening homepage.

Original issue reported on code.google.com by aslani....@gmail.com on 5 Jun 2015 at 11:04

[GoogleCodeExporter]

other conditions may cause this issue. after latest update from google play, 
this defect raised.

Original comment by aslani....@gmail.com on 5 Jun 2015 at 6:06

[GoogleCodeExporter]

regard to this steps:
1- talkback 4.2 is running
2- after a while, home and back keys do not function absolutely
3- from notification area by swiping down by two fingers, accessibility menu 
opened by myself
4- from 'vision' I tapped on talkback and turn it off.
5- then I pressed ''home' key three times to activate talkback again.
6- then 'home' and 'back' keys function properly.
7- conclusion: this conflict or defect falls into talkback functionality.

Original comment by aslani....@gmail.com on 8 Jun 2015 at 1:05

[GoogleCodeExporter]

I use Nexus 7 (2013) with Android 5.1.1 and the last week also noticed the home 
and back buttons become non responsive. it is as if talkback gets a brain 
freeze because if you leave it for a few seconds more it suddently starts 
working again.

Original comment by hdbr...@gmail.com on 8 Jun 2015 at 5:24