imgburn errors

i get these recurring errors from IMGBurn, when trying to backup a iso.
sometimes it happens and sometimes it doesnt
i have no idea what it might be, is my burner going out?

I 14:07:43 ImgBurn Version 2.4.4.0 started!
I 14:07:43 Microsoft Windows XP Professional (5.1, Build 2600 : Service Pack 3)
I 14:07:43 Total Physical Memory: 2,095,500 KB - Available: 1,638,992 KB
I 14:07:43 Initialising SPTI...
I 14:07:43 Searching for SCSI / ATAPI devices...
I 14:07:43 Found 1 DVD-ROM and 2 DVD±RWs!
I 14:08:55 Operation Started!
I 14:08:55 Source File: C:\360\Call Of Juarez Bound In Blood [MULTI5][X360][RF]
I 14:08:55 Source File Sectors: 3,827,488 (MODE1/2048)
I 14:08:55 Source File Size: 7,838,695,424 bytes
I 14:08:55 Source File Volume Identifier: DVD_ROM
I 14:08:55 Source File Volume Set Identifier: 356fc000MS UDFBridge
I 14:08:55 Source File Application Identifier: CDIMAGE 2.45 (12/06/2000 TM)
I 14:08:55 Source File Implementation Identifier: Microsoft CDIMAGE UDF
I 14:08:55 Source File File System(s): ISO9660, UDF (1.50)
I 14:08:55 Destination Device: [1:0:0] PLEXTOR DVDR PX-716A 1.11 (D (ATA)
I 14:08:55 Destination Media Type: DVD+R DL (Disc ID: MKM-001-00) (Speeds: 2.4x, 4x, 6x)
I 14:08:55 Destination Media Sectors: 4,173,824
I 14:08:55 Write Mode: DVD
I 14:08:55 Write Type: DAO
I 14:08:55 Write Speed: 2.4x
I 14:08:55 Link Size: Auto
I 14:08:55 Lock Volume: Yes
I 14:08:55 Test Mode: No
I 14:08:55 OPC: No
I 14:08:55 BURN-Proof: Enabled
I 14:08:55 Book Type Setting: DVD-ROM
I 14:08:55 Advanced Settings - AutoStrategy: Auto, PowerRec: Yes
I 14:08:55 Optimal L0 Data Zone Capacity: 1,913,760
I 14:08:55 Optimal L0 Data Zone Method: Copied From Original Disc
I 14:08:55 Set L0 Data Zone Capacity Succeeded!
I 14:08:55 Filling Buffer... (40 MB)
I 14:08:56 Writing LeadIn...
I 14:09:35 Writing Session 1 of 1... (1 Track, LBA: 0 - 3827487)
I 14:09:35 Writing Track 1 of 1... (MODE1/2048, LBA: 0 - 3827487)
I 14:09:35 Writing Layer 0... (LBA: 0 - 1913759)
W 14:28:24 Failed to Write Sectors 1834016 - 1834047 - Reason: Write Error - Recovery Needed
W 14:28:24 Retrying (1 of 20)...
I 14:28:24 Writing Sectors...
I 14:29:16 Writing Layer 1... (LBA: 1913760 - 3827487)
I 14:48:54 Synchronising Cache...
I 14:49:04 Closing Track...
I 14:49:06 Finalising Disc...
I 14:50:04 Exporting Graph Data...
I 14:50:04 Graph Data File: C:\Documents and Settings\Application Data\ImgBurn\Graph Data Files\PLEXTOR_DVDR_PX-716A_1.11_SATURDAY-JULY-11-2009_2-08_PM_MKM-001-00_2.4x.ibg
I 14:50:04 Export Successfully Completed!
I 14:50:04 Operation Successfully Completed! - Duration: 00:41:05
I 14:50:04 Average Write Rate: 3,245 KB/s (2.3x) - Maximum Write Rate: 4,540 KB/s (3.3x)
I 14:50:04 Cycling Tray before Verify...
I 14:50:48 Device Ready!
I 14:50:50 Operation Started!
I 14:50:50 Source Device: [1:0:0] PLEXTOR DVDR PX-716A 1.11 (D (ATA)
I 14:50:50 Source Media Type: DVD+R DL (Book Type: DVD-ROM) (Disc ID: MKM-001-00) (Speeds: 2.4x, 4x, 6x)
I 14:50:50 Image File: C:\360\Call Of Juarez Bound In Blood [MULTI5][X360][RF]\xxx-cjb\xxx-cjb.dvd
I 14:50:50 Image File Sectors: 3,827,488 (MODE1/2048)
I 14:50:50 Image File Size: 7,838,695,424 bytes
I 14:50:50 Image File Volume Identifier: DVD_ROM
I 14:50:50 Image File Volume Set Identifier: 356fc000MS UDFBridge
I 14:50:50 Image File Application Identifier: CDIMAGE 2.45 (12/06/2000 TM)
I 14:50:50 Image File Implementation Identifier: Microsoft CDIMAGE UDF
I 14:50:50 Image File File System(s): ISO9660, UDF (1.50)
I 14:50:50 Read Speed (Data/Audio): MAX / MAX
I 14:50:50 Verifying Session 1 of 1... (1 Track, LBA: 0 - 3827487)
I 14:50:50 Verifying Track 1 of 1... (MODE1/2048, LBA: 0 - 3827487)
I 14:50:50 Verifying Layer 0... (LBA: 0 - 1913759)
W 14:51:48 Failed to Read Sector 2944 - Reason: Unknown (Seek Error) (ASC: 0x02, ASCQ: 0x8D)
W 14:51:48 Sector 2944 maps to File: \$SystemUpdate\584E07D200000000
W 14:53:48 Retrying (1)...
W 14:54:17 Retry Failed - Reason: Unknown (Seek Error) (ASC: 0x02, ASCQ: 0x8D)
W 14:54:18 Retrying (2)...
W 14:54:46 Retry Failed - Reason: Unknown (Seek Error) (ASC: 0x02, ASCQ: 0x8D)
W 14:54:52 Retrying (3)...
W 14:55:20 Retry Failed - Reason: Unknown (Seek Error) (ASC: 0x02, ASCQ: 0x8D)
E 14:55:21 Failed to Read Sector 2944 - Reason: Unknown (Seek Error) (ASC: 0x02, ASCQ: 0x8D)
E 14:55:21 Sector 2944 maps to File: \$SystemUpdate\584E07D200000000
E 14:55:21 Failed to Verify Sectors!
I 14:55:22 Exporting Graph Data...
I 14:55:22 Graph Data File: C:\Documents and Settings\Application Data\ImgBurn\Graph Data Files\PLEXTOR_DVDR_PX-716A_1.11_SATURDAY-JULY-11-2009_2-08_PM_MKM-001-00_2.4x.ibg
I 14:55:22 Export Successfully Completed!
E 14:55:22 Operation Failed! - Duration: 00:04:31
I 14:55:22 Average Verify Rate: 21 KB/s (0.0x) - Maximum Verify Rate: 21 KB/s (0.0x)