Dennis, please open a separate bug for this, it seems to me like it's a different issue (the original reporter says nothing of dhcpcd, and the logs don't contain anything about it). Once done, report back the bug number here so we can look into it.
Anton, could you please try with default settings for the wireless network and check if things work fine? You might also want to check whether trying with your custom settings in /etc/network/interfaces removed it works properly.
Dennis, please open a separate bug for this, it seems to me like it's a different issue (the original reporter says nothing of dhcpcd, and the logs don't contain anything about it). Once done, report back the bug number here so we can look into it.
Anton, could you please try with default settings for the wireless network and check if things work fine? You might also want to check whether trying with your custom settings in /etc/network/ interfaces removed it works properly.
Thanks,