WOL works after systemctl suspend but not after auto-suspend

I successfully configured Wake-On-LAN on my computer. It works perfectly after using sudo systemctl suspend, but unable to wake after the auto-suspend delay (on Ubuntu, Settings -> Energy).

Information about my network card :

jml@jml-desktop:~$ sudo ethtool enp0s31f6
[sudo] Mot de passe de jml : 
Settings for enp0s31f6:
    Supported ports: [ TP ]
    Supported link modes:   10baseT/Half 10baseT/Full 
                            100baseT/Half 100baseT/Full 
                            1000baseT/Full 
    Supported pause frame use: No
    Supports auto-negotiation: Yes
    Supported FEC modes: Not reported
    Advertised link modes:  10baseT/Half 10baseT/Full 
                            100baseT/Half 100baseT/Full 
                            1000baseT/Full 
    Advertised pause frame use: No
    Advertised auto-negotiation: Yes
    Advertised FEC modes: Not reported
    Speed: 100Mb/s
    Duplex: Full
    Port: Twisted Pair
    PHYAD: 1
    Transceiver: internal
    Auto-negotiation: on
    MDI-X: on (auto)
    Supports Wake-on: pumbg
    Wake-on: g
    Current message level: 0x00000007 (7)
                   drv probe link
    Link detected: yes

jml@jml-desktop:~$ lspci
00:00.0 Host bridge: Intel Corporation 8th Gen Core Processor Host Bridge/DRAM Registers (rev 07)
00:02.0 VGA compatible controller: Intel Corporation Device 3e92
00:14.0 USB controller: Intel Corporation 200 Series/Z370 Chipset Family USB 3.0 xHCI Controller
00:14.2 Signal processing controller: Intel Corporation 200 Series PCH Thermal Subsystem
00:16.0 Communication controller: Intel Corporation 200 Series PCH CSME HECI #1
00:17.0 RAID bus controller: Intel Corporation SATA Controller [RAID mode]
00:1f.0 ISA bridge: Intel Corporation Z370 Chipset LPC/eSPI Controller
00:1f.2 Memory controller: Intel Corporation 200 Series/Z370 Chipset Family Power Management Controller
00:1f.3 Audio device: Intel Corporation 200 Series PCH HD Audio
00:1f.4 SMBus: Intel Corporation 200 Series/Z370 Chipset Family SMBus Controller
00:1f.6 Ethernet controller: Intel Corporation Ethernet Connection (2) I219-V

jml@jml-desktop:~$ ifconfig
enp0s31f6: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
        inet 192.168.1.95  netmask 255.255.255.0  broadcast 192.168.1.255
        inet6 fe80::43ea:534a:d75:2312  prefixlen 64  scopeid 0x20<link>
        ether 70:85:c2:74:eb:ff  txqueuelen 1000  (Ethernet)
        RX packets 8314  bytes 5908266 (5.9 MB)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 7996  bytes 1285137 (1.2 MB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0
        device interrupt 16  memory 0xdf000000-df020000  

Thanks !