消えた GPU

以下の Huawei マシンですが、突然 GPU の認識数が 4 から 3 になってしまいました。。。
Tesla K40m Off | 0000:43:00.0 Off | 0 | というのが行方不明です。

◯現在の構成
> nvidia-smi
Thu Sep 1 23:32:16 2016
+------------------------------------------------------+
| NVIDIA-SMI 352.39 Driver Version: 352.39 |
|-------------------------------+----------------------+----------------------+
| GPU Name Persistence-M| Bus-Id Disp.A | Volatile Uncorr. ECC |
| Fan Temp Perf Pwr:Usage/Cap| Memory-Usage | GPU-Util Compute M. |
|===============================+======================+======================|
| 0 Tesla K40m Off | 0000:42:00.0 Off | 0 |
| N/A 33C P0 61W / 235W | 22MiB / 11519MiB | 0% Default |
+-------------------------------+----------------------+----------------------+
| 1 Tesla K40m Off | 0000:81:00.0 Off | 0 |
| N/A 30C P0 62W / 235W | 22MiB / 11519MiB | 0% Default |
+-------------------------------+----------------------+----------------------+
| 2 Tesla K40m Off | 0000:82:00.0 Off | 0 |
| N/A 32C P0 63W / 235W | 22MiB / 11519MiB | 38% Default |
+-------------------------------+----------------------+----------------------+

+-----------------------------------------------------------------------------+
| Processes: GPU Memory |
| GPU PID Type Process name Usage |
|=============================================================================|
| No running processes found |
+-----------------------------------------------------------------------------+


◯以前の構成：
> nvidia-smi
Sat Jul 18 19:11:42 2015
+------------------------------------------------------+
| NVIDIA-SMI 346.46 Driver Version: 346.46 |
|-------------------------------+----------------------+----------------------+
| GPU Name Persistence-M| Bus-Id Disp.A | Volatile Uncorr. ECC |
| Fan Temp Perf Pwr:Usage/Cap| Memory-Usage | GPU-Util Compute M. |
|===============================+======================+======================|
| 0 Tesla K40m Off | 0000:42:00.0 Off | 0 |
| N/A 34C P0 61W / 235W | 55MiB / 11519MiB | 0% Default |
+-------------------------------+----------------------+----------------------+
| 1 Tesla K40m Off | 0000:43:00.0 Off | 0 |
| N/A 33C P0 61W / 235W | 55MiB / 11519MiB | 0% Default |
+-------------------------------+----------------------+----------------------+
| 2 Tesla K40m Off | 0000:81:00.0 Off | 0 |
| N/A 30C P0 62W / 235W | 55MiB / 11519MiB | 0% Default |
+-------------------------------+----------------------+----------------------+
| 3 Tesla K40m Off | 0000:82:00.0 Off | 0 |
| N/A 33C P0 63W / 235W | 55MiB / 11519MiB | 33% Default |
+-------------------------------+----------------------+----------------------+

+-----------------------------------------------------------------------------+
| Processes: GPU Memory |
| GPU PID Type Process name Usage |
|=============================================================================|
| No running processes found |
+-----------------------------------------------------------------------------+