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dhcpcd loses IP address after update [debian unstable]

Hi,

I am running debian unstable and just upgraded the system.
I use dhcpcd (2.0.3) as DHCP client, which worked fine until the update.
So, now I dhcpcd gets everything from the DHCP server but seems to forget it almost immediately (it then falls back to some IPv4 link-local address). 
Here is how it goes:

- ifup eth0
   ... dhcpcd.exe confirms IP Addr 192.150.186.186

- ifconfig (immediately after)

eth0      Link encap:Ethernet  HWaddr 00:06:5B:89:58:F8
inet addr:192.150.186.186 Bcast:192.150.186.255 Mask:255.255.255.0 
          UP BROADCAST NOTRAILERS RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:3194 errors:0 dropped:0 overruns:1 frame:0
          TX packets:22 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:316287 (308.8 KiB)  TX bytes:3498 (3.4 KiB)
          Interrupt:11 Base address:0xa000

lo        Link encap:Local Loopback
          inet addr:127.0.0.1  Mask:255.0.0.0
          UP LOOPBACK RUNNING  MTU:16436  Metric:1
          RX packets:4 errors:0 dropped:0 overruns:0 frame:0
          TX packets:4 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0
          RX bytes:276 (276.0 b)  TX bytes:276 (276.0 b)

- ifconfig (again some seconds later)

eth0      Link encap:Ethernet  HWaddr 00:06:5B:89:58:F8
inet addr:169.254.204.255 Bcast:169.254.255.255 Mask:255.255.0.0 
          UP BROADCAST NOTRAILERS RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:3343 errors:0 dropped:0 overruns:1 frame:0
          TX packets:23 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:331386 (323.6 KiB)  TX bytes:3558 (3.4 KiB)
          Interrupt:11 Base address:0xa000

lo        Link encap:Local Loopback
          inet addr:127.0.0.1  Mask:255.0.0.0
          UP LOOPBACK RUNNING  MTU:16436  Metric:1
          RX packets:4 errors:0 dropped:0 overruns:0 frame:0
          TX packets:4 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0
          RX bytes:276 (276.0 b)  TX bytes:276 (276.0 b)

So it seems that the IP Addr gets lost somewhere.
I am not aware of any other network configuration software that is running.
As an exercise I even deleted everything from /etc/rc2.d in order to eliminate interferences with any other deamons. 
Nothing changed, though.

my /etc/network/interfaces looks like this:

auto lo
iface lo inet loopback

auto eth0
iface eth0 inet dhcp


Do you have any ideas about this strange behavior?
Any help would be greatly appreciated.

Many Thanks,
Jan
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