MAG256w1 won't turn off

I've just bought a MAG256w1 (the one with the built-in WiFi module)

Everything looks fine so far, except for one thing : the MAG won't turn off using the remote. I need to unplug it to do so.

Did someone have an idea ?

Thank in advance,

Creekorful

PS: firmware version is : 2.20.04-256 (image version : 220)

Update : trying to dowgrade to 2.20.03-256 but doesn't work either.

The led on the MAG blink when I hit power-off button so It isn't a hardware problem I think.