@hokpe 

i am having the 100% exact same problem.

bought a few of these and 1 of them is behaving exactly how you describe. i tried everything... new repeater, new positions, angle changes, zone changes...

it just wont trigger automatically whatever i do or change in settings, when the app is closed.

it only triggers while in live view, i.e when i have the app open and look at the live feed of that camera, it triggers, but also here i notice it only triggers once.

so when i enter the area, bing i get the trigger message... waiting till retrigger and buffer time ran off you enter the zone again but than there is no message anymore.

the cam indicates the tag "person and motion", but no message anymore...

firmware is up to date... etc... 

i do not know what to do anymore, it just does not do what its supposed to do.

  @hokpe 

today the trouble maker c425 received a firmware update to 1.3.5 from 1.3.4.

interestingly is the other c425 i have not showing any available update... and indicated being up to date.

this is getting more and more interesting. @TP-Link @Tom_TP-Link  whats going on here?

  @tomstt 

I have returned my unit and reordered a new one. I'm hoping that the new unit will not have the same issues.

  @hokpe so Firmware update 1.3.5 seems to have solved the issue...

solar panel chargeing is crastically improved ... and the description mentions a few other bugs... but the most important it mentiones enhanced motion detections functionalities...

and what to say... it really seems to have resolved the issue....  now after hte last firmare update of 1 of the cams i also got the notification to update the other cams...

  @tomstt have you had any joy getting your c425 to work properly? I am having the exact same issue and beginning to think Ivwasted my money.

  @Ame12 I have a new unit that is working well with firmware version 1.3.7. I returned my original unit and got this one. If you have newest sw version and still not working. Maybe you need to return the unit as well.

  @hokpe all good with the new one?

  @SebbyMax Yeah, it is working as expected.

  @hokpe 

Mine not the best either. I have it in my car and you have to be on top of it to set it off.