I managed to get the relay unstuck by tapping it lightly, but after a few days it got stuck again and this time I didn't manage to fix it.
I replaced the board by a new one, and after only four days I have the exact same issue Relays #15 and #31 stay stuck, and tapping them doesn't fix the issue.
I replaced the board by a new one, and after only four days I have the exact same issue Relays #15 and #31 stay stuck, and tapping them doesn't fix the issue.