Hi,
I have Aqara door sensors placed on my wardrobe doors and they should trigger lighting inside the wardrobe to go on/off depending on door closed or not. This worked fine until a few days ago, I don’t know why it stopped working… I have examined the devices as far as I can but cannot see anything strange. Except, I get timeout errors. The batteries seem fine.
Update: door sensor is Aqara, one of the lightstrips is Aqara and the other light is using an Innr smartplug.
Can you make a screenshot of your flow to see how things are being set-up?
Also which brand you are using? Did you consider placing this post in the corresponding Community page? Did you use the search functionality? 
Hi,
yeah, sorry 
Obviously I should have mentioned that the door sensor is from Aqara, one of the lightstrips is Aqara too and the other light is using an Innr smartplug.
I will post my flows shortly when I can, but they are very simple (sensor contact off means light goes on). No other conditions. They worked fine up until recently.
It should be the other way around though. Contact alarm off → Light off
If it did work before then at least one of the devices being used isn’t working as expected anymore. (Yeah i know being captain obvious here).
Sensor:
Lights:
When using advanced flows you could create a timeline message on each action to log what’s actually happening. “sensor detected [state]” / “light on because sensor”.
Or connect them with the “error” dot (on the bottom of the card) to print the error to the timeline. “Could not turn on light because [error]” (error is a tag when connecting a card to the error connection (or however it is called) as shown here:
Hi Captain
Well, one of the lights report activity from 9 days ago, so apparently it doesn’t feel too well I guess. The other light strip (Aqara) reported 3 hours ago. Manual on/off seems to work on the Aqara led strip at least… I could try doing the advanced flow later. The sensor history seem fine on both.
I have tried both… 
Depending on how the flow is actually build, maybe the light that has an issue (history 9 days ago) is the cause of the other lights not working as expected too.
Combined with Homey zigbee, these sensors tend to stop sending events as soon as they use an ‘incompatible’ zigbee router, like for example Ikea lights. And worse, they stop looking for other zigbee routers in order to reach the controller (Homey).
You can temporary fix it by re-pairing the sensor, without removing it from Homey.
Homey will notify you with “device is already added”: ignore that, and restart the Aqara app.
