Port Forwarding to VirtualBox Image Finishes After Pausing / Resuming

Question

We use vagrant to install the VirtualBox image with Ubuntu Linux. It has a private network, and several ports are forwarded - here are some snippets from our Vagrantfile:

config.vm.network :private_network, ip: "192.168.33.10"

config.vm.network "forwarded_port", guest: 3306, host: 3306  #mysql
...
config.vm.network "forwarded_port", guest: 8098, host: 8098  #riak http
config.vm.network "forwarded_port", guest: 8087, host: 8087  #riak pb

This works when starting a virtual machine.

But after the host computer is suspended for a while (a shorter period) and resumes, port forwarding no longer works.

Everything responds perfectly to the allocated address of the private network 192.168.33.10, but not to localhostwhere the attempt simply hangs.

Any ideas for a solution?

Specifications:

Host OS: Mac OS X, version 10.9 "Mavericks"  
Guest OS: Ubuntu 12.04, precise64 (standard box from vagrantup.com)
Vagrant 1.4.0  
VirtualBox version: VirtualBox 4.3.4 r91027  

Virtual Box > Machine Settings > Network
  Adapter 1: 
    Attached to: NAT
    Cable Connected : True
    Port Forwarding:
      TCP, HostIP=,          HostPort=3306, GuestIP=, GuestPort=3306
      TCP, HostIP=,          HostPort=8098, GuestIP=, GuestPort=8098
      TCP, HostIP=,          HostPort=8087, GuestIP=, GuestPort=8087
      TCP, HostIP=127.0.0.1, HostPort=2222, GuestIP=, GuestPort=22

I found a similar question but cannot use the same answer: VirtualBox port forwarding does not work with NAT adapter