AutoTools Fingerprint task sporadic function

Can anyone tell me why my autotools fingerprint unlocker sometimes works and sometimes fails.
This is the profile, using a Mate 9 (android 7) with an instant acting fingerprint reader.
It's using a profile from here I believe, it simply locks a chosen app (in this case Explorer FX) until you verify it with the fingerprint reader.
Sometimes it works, sometimes it doesn't but not sure why it's like that.

Code (Text):

Profile: Fingerprint Authenticator (48)
Application: FX
Enter: Fingerprint (47)
A1: AutoTools Dialog [ Configuration:Dialog Type: Fingerprint
Title: Security Protocol
Number Of Tries: 1
Icon: android.resource://net.dinglisch.android.taskerm/hd_device_access_secure
Text: Fingerprint authentication required
Text Size: 20
Dim Background: true
Top Margin: 16
Bottom Margin: 16
Bottom Buttons Top Margin: 16
Bottom Buttons Bottom Margin: 16
Cancelable: true
Turn Screen On: true Timeout (Seconds):60 Continue Task After Error:On ]
A2: If [ %atbutton ~ 2 ]
A3: Popup [ Title: Text:Successful App Unlocked Background Image: Layout:popup Timeout (Seconds):1 Show Over Keyguard:On ]
A4: Else
A5: Play Ringtone [ Type:Notification Sound:Hangouts Message Stream:3 ]
A6: Wait [ MS:300 Seconds:2 Minutes:0 Hours:0 Days:0 ]
A7: Popup [ Title: Text:Denied Closing App Background Image: Layout:popup Timeout (Seconds):2 Show Over Keyguard:On ]
A8: Go Home [ Page:0 ]
A9: End If

 

Sure if it doesn't work the ELSE statement kicks in, so I get the 'access denied' popup and the app closes. No idea why though, it will work fine like 3, 4, 5 times then for no reason it'll 'access deny' then the next time it'll work again. only a small inconvenience but curious as to why it would fail at all

 

It's set at 1 currently, should I try 2? what will that do

 

Ok I'll give that a shot thanks.