The dmesg log below shows up a possible issue.
The USB device idVendor=1c6b, idProduct=a223 is a generic
Philips/Lite-ON CDROM drive
The drive allocated to usb 1-1.2 .  Scatterlist errors is logged against
the 1.2 device and next message says "high-speed USB device number 4" -
so clearly there is an issue with the CDROM drive.

These errors are not "normal". However I don't know whether they are
minor.
AFAICT scatterlist errors are due to handling memory when doing I/O
transfer.
So there may be an issue with the drive or memory during data transfer. 

How much free memory is on your system when LMS is running. Use the free
command from a prompt
My system "free" is as follows

Code:
--------------------
    
  total        used        free      shared  buff/cache   available
  Mem:         996096      142064      716244       26496      137788      
811628
  Swap:        237804           0      237804
  
--------------------



Code:
--------------------
    
  [ 3.078924] usb 1-1.2: new high-speed USB device number 4 using dwc_otg
  [ 3.213562] usb 1-1.2: New USB device found, idVendor=1c6b, idProduct=a223, 
bcdDevice= 0.00
  [ 3.213570] usb 1-1.2: New USB device strings: Mfr=1, Product=2, 
SerialNumber=3
  [ 3.213576] usb 1-1.2: Product: Mass Storage Device
  [ 3.213582] usb 1-1.2: Manufacturer: USB2.0 External
  [ 3.213588] usb 1-1.2: SerialNumber: 97 436122507494
  [ 3.216200] usb-storage 1-1.2:1.0: USB Mass Storage device detected
  [ 3.216921] scsi host0: usb-storage 1-1.2:1.0
  .
  .
  [ 4.254623] scsi 0:0:0:0: CD-ROM ASUS SDRW-08D2S-U BA01 PQ: 0 ANSI: 0
  .
  .
  [ 18.219906] sr 0:0:0:0: Power-on or device reset occurred
  [ 18.236372] sr 0:0:0:0: [sr0] scsi3-mmc drive: 24x/24x writer cd/rw xa/form2 
cdda tray
  [ 18.236391] cdrom: Uniform CD-ROM driver Revision: 3.20
  .
  .
  [ 327.505270] dwc_otg 3f980000.usb: dev 1.2 ep1in scatterlist error -121/-121
  [ 392.288979] usb 1-1.2: reset high-speed USB device number 4 using dwc_otg
  [ 392.425696] dwc_otg 3f980000.usb: dev 1.2 ep1in scatterlist error -121/-121
  
--------------------


------------------------------------------------------------------------
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