Hello Cristopher,
I have managed to update the firmware of all the servers. The issue is still 
happening:

# dmidecode -s bios-version && sudo dmidecode -s bios-release-date
2.10
01/09/2014

# uname -a
Linux <hostname> 3.13.0-44-generic #73-Ubuntu SMP Tue Dec 16 00:22:43 UTC 2014 
x86_64 x86_64 x86_64 GNU/Linux

After starting an high bandwidth load (backups):

[95407.726267] e1000e 0000:00:19.0 eth1: Detected Hardware Unit Hang:
[95407.726267]   TDH                  <0>
[95407.726267]   TDT                  <1>
[95407.726267]   next_to_use          <1>
[95407.726267]   next_to_clean        <0>
[95407.726267] buffer_info[next_to_clean]:
[95407.726267]   time_stamp           <1016abfd3>
[95407.726267]   next_to_watch        <0>
[95407.726267]   jiffies              <1016ac6eb>
[95407.726267]   next_to_watch.status <0>
[95407.726267] MAC Status             <40080183>
[95407.726267] PHY Status             <796d>
[95407.726267] PHY 1000BASE-T Status  <3800>
[95407.726267] PHY Extended Status    <3000>
[95407.726267] PCI Status             <10>
[95409.726297] e1000e 0000:00:19.0 eth1: Detected Hardware Unit Hang:
[95409.726297]   TDH                  <0>
[95409.726297]   TDT                  <1>
[95409.726297]   next_to_use          <1>
[95409.726297]   next_to_clean        <0>
[95409.726297] buffer_info[next_to_clean]:
[95409.726297]   time_stamp           <1016abfd3>
[95409.726297]   next_to_watch        <0>
[95409.726297]   jiffies              <1016ac8df>
[95409.726297]   next_to_watch.status <0>
[95409.726297] MAC Status             <40080183>
[95409.726297] PHY Status             <796d>
[95409.726297] PHY 1000BASE-T Status  <3800>
[95409.726297] PHY Extended Status    <3000>
[95409.726297] PCI Status             <10>
[95409.729969] e1000e 0000:00:19.0 eth1: Reset adapter unexpectedly


** Changed in: linux (Ubuntu)
       Status: Expired => Confirmed

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https://bugs.launchpad.net/bugs/1391674

Title:
  "Reset adapter unexpectedly" - NIC hangs using e1000e driver under
  average I/O

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