Macvtap connectivity lost after a few hours?

I setup a macvtap interface like this: ip link add link eth0 vlan type macvlan mode bridge ip address add 10.0.0.17 dev vlan ip link set dev vlan up ip route flush dev eth0 ip route flush dev vlan ip route add 10.0.0.0/24 dev vlan metric 0 ip route add default via 10.0.0.1 ip link add link eth0 name vtap address xx:xx:xx:xx:xx:xx type macvtap mode bridge ip link set vtap up ip address flush eth0 ip address flush vtap dhclient -v vtap ip address flush vtap And it works fine for a couple of hours. But after that, any connections to the DHCP (macvtap) IP will start going to the host machine instead. So if I connect to the IP at port 80 for example, I will see a page served by the host instead of the VM. I am trying to understand why it stops working. At first I thought maybe the DHCP lease expired, and dhclient is not renewing it. But the leasetime is 24 hours, and this problem starts earlier than that, sometimes in less than 10 hours. So what can be causing the macvtap interface to stop working?