USB Device is gone Errors

Hello,
do you know how can we suppress USB disk error in /var/adm/messages?:
1) First we had these kind of errors in messages:
Nov 10 02:00:55 server1 scsi: [ID 107833 kern.warning] WARNING: /pci@0/pci@0/pci@1/pci@0/pci@1/pci@0/usb@0,2/storage@2/disk@0,0 (sd2):
Our monitoring solution keeps an eye on any warnings on errors in messages file and reports false alarms in this case.
2) Then we tried to suppress this warning by disconnecting USB device:
server1-root:/export/home/root# cfgadm -c disconnect usb2/2
Disconnect the device: /devices/pci@0/pci@0/pci@1/pci@0/pci@1/pci@0/usb@0,2:2
This operation will suspend activity on the USB device
Continue (yes/no)? yes
server1-root:/export/home/root# cfgadm -al
Ap_Id                          Type         Receptacle   Occupant     Condition
c1                             scsi-sata    connected    configured   unknown
c1::dsk/c1t0d0                 disk         connected    configured   unknown
c1::dsk/c1t1d0                 disk         connected    configured   unknown
c1::dsk/c1t2d0                 disk         connected    configured   unknown
c1::dsk/c1t3d0                 disk         connected    configured   unknown
c2                             fc-fabric    connected    configured   unknown
c2::5006048452a8dc47           disk         connected    configured   unknown
c3                             fc-fabric    connected    configured   unknown
c3::5006048452a8dc68           disk         connected    configured   unknown
usb0/1                         unknown      empty        unconfigured ok
usb0/2                         unknown      empty        unconfigured ok
usb0/3                         unknown      empty        unconfigured ok
usb1/1                         unknown      empty        unconfigured ok
usb1/2                         unknown      empty        unconfigured ok
usb2/1                         unknown      empty        unconfigured ok
usb2/2                         unknown      disconnected unconfigured ok
usb2/3                         unknown      empty        unconfigured ok
usb2/4                         usb-hub      connected    configured   ok
usb2/4.1                       unknown      empty        unconfigured ok
usb2/4.2                       unknown      empty        unconfigured ok
usb2/4.3                       unknown      empty        unconfigured ok
usb2/4.4                       unknown      empty        unconfigured ok
usb2/5                         unknown      empty        unconfigured ok
3) But now it reports another warning in messages log file:
Jan 7 19:38:31 server1 scsi: [ID 107833 kern.warning] WARNING: /pci@0/pci@0/pci@1/pci@0/pci@1/pci@0/usb@0,2/storage@2/disk@0,0 (sd2):
Jan 7 19:38:31 server1   Command failed to complete...Device is gone
What is trying to access USB? Is it USB controller or disk drive which is causing problems? How to completely disable this warning?
Thank you

I don't think it is HW/DVD issue. We have 60+ servers with this problem - the same usb warnings in messages file.
[root@server1:/]$ cfgadm -alv
Ap_Id                          Receptacle   Occupant     Condition Information
When         Type         Busy     Phys_Id
c1                             connected    configured   unknown
unavailable scsi-sata    n        /devices/pci@0/pci@0/pci@2/scsi@0:scsi
c1::dsk/c1t0d0                 connected    configured   unknown    SEAGATE ST914602SSUN146G
unavailable disk         n        /devices/pci@0/pci@0/pci@2/scsi@0:scsi::dsk/c1t0d0
c1::dsk/c1t1d0                 connected    configured   unknown    SEAGATE ST914602SSUN146G
unavailable disk         n        /devices/pci@0/pci@0/pci@2/scsi@0:scsi::dsk/c1t1d0
usb0/1                         empty        unconfigured ok
unavailable unknown      n        /devices/pci@0/pci@0/pci@1/pci@0/pci@1/pci@0/usb@0:1
usb0/2                         empty        unconfigured ok
unavailable unknown      n        /devices/pci@0/pci@0/pci@1/pci@0/pci@1/pci@0/usb@0:2
usb0/3                         empty        unconfigured ok
unavailable unknown      n        /devices/pci@0/pci@0/pci@1/pci@0/pci@1/pci@0/usb@0:3
usb1/1                         empty        unconfigured ok
unavailable unknown      n        /devices/pci@0/pci@0/pci@1/pci@0/pci@1/pci@0/usb@0,1:1
usb1/2                         empty        unconfigured ok
unavailable unknown      n        /devices/pci@0/pci@0/pci@1/pci@0/pci@1/pci@0/usb@0,1:2
usb2/1                         empty        unconfigured ok
unavailable unknown      n        /devices/pci@0/pci@0/pci@1/pci@0/pci@1/pci@0/usb@0,2:1
usb2/2                         connected    configured   ok         Mfg: Texas Instruments Incorporated Product: 6250 FW: 04.02.02.22.562AD423 NConfigs: 1 Config: 0 <no cfg str descr>
unavailable usb-storage n        /devices/pci@0/pci@0/pci@1/pci@0/pci@1/pci@0/usb@0,2:2
usb2/3                         empty        unconfigured ok
unavailable unknown      n        /devices/pci@0/pci@0/pci@1/pci@0/pci@1/pci@0/usb@0,2:3
usb2/4                         empty        unconfigured ok
unavailable unknown      n        /devices/pci@0/pci@0/pci@1/pci@0/pci@1/pci@0/usb@0,2:4
usb2/5                         empty        unconfigured ok
unavailable unknown      n        /devices/pci@0/pci@0/pci@1/pci@0/pci@1/pci@0/usb@0,2:5
Texas Instruments Incorporated Product: 6250
is here - don't know is it just a chip on MB or a chip in DVD drive?
TUSB6250 | USB Peripheral | USB | Description & parametrics
On another server I have this:
Jan 7 19:38:06 server2 scsi: [ID 107833 kern.warning] WARNING: /pci@0/pci@0/pci@1/pci@0/pci@1/pci@0/usb@0,2/device@2/storage@0/disk@0,0 (sd2):
Jan 7 19:38:06 server2   Command failed to complete...Device is gone
[root@server2:/]$ cfgadm -alv
Ap_Id                          Receptacle   Occupant     Condition Information
When         Type         Busy     Phys_Id
c1                             connected    configured   unknown
unavailable scsi-sata    n        /devices/pci@0/pci@0/pci@2/scsi@0:scsi
c1::dsk/c1t0d0                 connected    configured   unknown    SEAGATE ST930003SSUN300G
unavailable disk         n        /devices/pci@0/pci@0/pci@2/scsi@0:scsi::dsk/c1t0d0
c1::dsk/c1t1d0                 connected    configured   unknown    SEAGATE ST930003SSUN300G
unavailable disk         n        /devices/pci@0/pci@0/pci@2/scsi@0:scsi::dsk/c1t1d0
usb0/1                         empty        unconfigured ok
unavailable unknown      n        /devices/pci@0/pci@0/pci@1/pci@0/pci@1/pci@0/usb@0:1
usb0/2                         empty        unconfigured ok
unavailable unknown      n        /devices/pci@0/pci@0/pci@1/pci@0/pci@1/pci@0/usb@0:2
usb0/3                         empty        unconfigured ok
unavailable unknown      n        /devices/pci@0/pci@0/pci@1/pci@0/pci@1/pci@0/usb@0:3
usb1/1                         empty        unconfigured ok
unavailable unknown      n        /devices/pci@0/pci@0/pci@1/pci@0/pci@1/pci@0/usb@0,1:1
usb1/2                         empty        unconfigured ok
unavailable unknown      n        /devices/pci@0/pci@0/pci@1/pci@0/pci@1/pci@0/usb@0,1:2
usb2/1                         empty        unconfigured ok
unavailable unknown      n        /devices/pci@0/pci@0/pci@1/pci@0/pci@1/pci@0/usb@0,2:1
usb2/2                         connected    configured   ok         Mfg: OEM Product: Mass Storage plus NConfigs: 1 Config: 0 : Configuration0
unavailable usb-device   n        /devices/pci@0/pci@0/pci@1/pci@0/pci@1/pci@0/usb@0,2:2
usb2/3                         empty        unconfigured ok
unavailable unknown      n        /devices/pci@0/pci@0/pci@1/pci@0/pci@1/pci@0/usb@0,2:3
usb2/4                         empty        unconfigured ok
unavailable unknown      n        /devices/pci@0/pci@0/pci@1/pci@0/pci@1/pci@0/usb@0,2:4
usb2/5                         empty        unconfigured ok
unavailable unknown      n        /devices/pci@0/pci@0/pci@1/pci@0/pci@1/pci@0/usb@0,2:5

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