I have just started using a Dragino LPS8 in the AU-band, and after noticing that the downlinks seemed unreliable I took a closed look, did a test, and I noticed that the gateway on a regular basis does not transmit the downlink, although the TTN console shows that one was generated and forwarded in due time (usually takes 200 - 300 ms).
I have a spectrum analyser constantly logging the downstream band in parallel to my test messages running back and forth, so I can see exactly if the gateway transmits anything or not.
If a downlink is skipped, it always seems to be in RX1, according to the TTN console. It does not seem to be channel or SF dependent.
Is there anyone Dragino user who has noticed this? I have found similar problems with earlier versions of the Dragino gateway, but I haven’t found any similar observations for the LPS8
[edit/add] it’s about one in three downlinks in RX1 that fail, so the majority does come through, but still for my application this is very annoying.