msk0 watchdog timeout and interrupt storm

Hello Community,
I hope someone could help me with this problem. The last days I have tried to find a solution, but haven't found one.
The watchdog timeout happens, when I'm going to download something or copy a file on my FTP server. When I start the transfer of the file, I wait a moment and then my down-/upload freezes at something around 500[ ]KB. After waiting a little while or press a key like "return", it comes to the interrupt storm.

interrupt storm detected on "irq51:"; throttling interrupt source

Here is some information about my system:
ifconfig msk0
msk0: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> metric 0 mtu 1500 options=c009b<RXCSUM,TXCSUM,VLAN_MTU,VLAN_HWTAGGING,VLAN_HWCSUM,VLAN_HWTSO,LINKSTATE> ether bc:ae:c5:5a:ef:ec inet 192.168.2.30 netmask 0xffffff00 broadcast 192.168.2.255 nd6 options=29<PERFORMNUD,IFDISABLED,AUTO_LINKLOCAL> media: Ethernet autoselect (100baseTX <full-duplex,flowcontrol,rxpause,txpause>) status: active

pciconf -lv
mskc0_at_pci0:3:0:0: class=0x020000 card=0x84391043 chip=0x438111ab rev=0x11 hdr=0x00 vendor = 'Marvell Technology Group Ltd.' device = 'Yukon Optima 88E8059 [PCIe Gigabit Ethernet Controller with AVB]' class = network subclass = ethernet

vmstat -i
interrupt total rateirq1: atkbd0 916 2irq16: hdac1 97 0irq17: ehci0 ehci1+ 8729 21irq18: ohci0 ohci1* 67 0irq19: ahci1 2883 7irq25: hdac0 4 0irq51: mskc0 90 0irq256: hpet0:t0 30332 75Total 43118 107

loader.conf
hw.msk.msi_disable=1hw.pci.enable_msi=0hw.pci.enable_msix=0rc.confCode:hostname="FreeBSD.local.domain"keymap="german.iso.acc.kbd"ifconfig_msk0="DHCP"
sshd_enable="YES"moused_enable="YES"powerd_enable="YES"# Set dumpdev to "AUTO" to enable crash dumps, "NO" to disabledumpdev="AUTO"

I have also tried to change ifconfig_msk0="DHCP" to ifconfig_msk0="SYNCDHCP" but nothing changed.
If nothing helps, I will buy a new network card. 

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Hello Community,I hope someone could help me with this problem. The last days I have tried to find a solution, but haven't found one.The watchdog timeout happens, when I'm going to download something or copy a file on my FTP server. When I start the transfer of the file, I wait a moment and then my down-/upload freezes at something around 500 KB. After waiting a little while or press a key like "return", it comes to the interrupt storm.interrupt storm detected on "irq51:"; throttling interrupt sourceHere is some information about my system:ifconfig msk0msk0: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> metric 0 mtu 1500
	options=c009b<RXCSUM,TXCSUM,VLAN_MTU,VLAN_HWTAGGING,VLAN_HWCSUM,VLAN_HWTSO,LINKSTATE>
	ether bc:ae:c5:5a:ef:ec
	inet 192.168.2.30 netmask 0xffffff00 broadcast 192.168.2.255 
	nd6 options=29<PERFORMNUD,IFDISABLED,AUTO_LINKLOCAL>
	media: Ethernet autoselect (100baseTX <full-duplex,flowcontrol,rxpause,txpause>)
	status: activepciconf -lvmskc0_at_pci0:3:0:0:	class=0x020000 card=0x84391043 chip=0x438111ab rev=0x11 hdr=0x00
    vendor     = 'Marvell Technology Group Ltd.'
    device     = 'Yukon Optima 88E8059 [PCIe Gigabit Ethernet Controller with AVB]'
    class      = network
    subclass   = ethernetvmstat -iinterrupt                          total       rate
irq1: atkbd0                         916          2
irq16: hdac1                          97          0
irq17: ehci0 ehci1+                 8729         21
irq18: ohci0 ohci1*                   67          0
irq19: ahci1                        2883          7
irq25: hdac0                           4          0
irq51: mskc0                          90          0
irq256: hpet0:t0                   30332         75
Total                              43118        107loader.confhw.msk.msi_disable=1
hw.pci.enable_msi=0
hw.pci.enable_msix=0
rc.conf
hostname="FreeBSD.local.domain"
keymap="german.iso.acc.kbd"
ifconfig_msk0="DHCP"sshd_enable="YES"
moused_enable="YES"
powerd_enable="YES"
# Set dumpdev to "AUTO" to enable crash dumps, "NO" to disable
dumpdev="AUTO"I have also tried to change ifconfig_msk0="DHCP" to ifconfig_msk0="SYNCDHCP" but nothing changed.If nothing helps, I will buy a new network card.