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Animus Heart?

Problem with Nexa GMR-824

Just bought my Heart and it works fine except for one strange thing.
I have a Nexa GMR-824 a 433 MHz, 3-channel ON/OFF switch.

No problem pairing it with the Heart. And turning if on/off is no problem either.
But. Channel 1 keeps turning itself on. Its connected to some lights.
No problem with channel 2 and 3. Have had the switch for a couple of years and it have worked perfectly with my Tellstick Net.

Any suggenstions where to start troubleshooting?
Have removed/paired it several times but the problem remains.