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 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: 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 = 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 107
My loader.conf:
hw.msk.msi_disable=1
hw.pci.enable_msi=0
hw.pci.enable_msix=0
My 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. 
P.S: Can someone delete my other 2 posts? The format of them was horrible and the another one has no subject :(