Vlan database deleted after switch reload

Dear Team
I have an access switch (C2960S-48FPS-L) which is running on version (universalk9-mz.122-55.SE5).
This switch was running on VTP client mode and connected to distribution switch running on VTP client mode and vtp version 3, due to power failure the switch got reloaded and after reload it came to VTP server mode and all the vlans were deleted, but the SVI of the vlan and all other config was still there.
I noticesd the same behavior with other switches of model (C2960S-48FPS-L & WS-C3560X-48PF-L) running on the following IOS
1) 12.2(55)SE'X' (here X means, it could be SE3,SE4,SE5etc)
2) 12.2)58SE'X' (here X means, it could be SE3,SE4, SE5 etc)
3) 15.0(2)SE (here X means, it could be SE3,SE4, SE5 etc)
I also noticed the following error during switch reload.
"%SW_VLAN-4-BAD_VLAN_CONFIGURATION_FILE: VLAN configuration file contained incorrect verification word:[hex]."
The issue is intermittent means the same switch will not have issue sometime after reload but sometime it will have this issue.
Anybody have any idea, is this bug causing this issue or something else.
Appreciate your response.

Duplicate post.
Go HERE.

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Hi, I tried deleting the vlan database on a 2950 switch. delete flash:/vlan.dat
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Enter configuration commands, one per line. End with CNTL/Z.
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Switch(config-vlan)#name toto
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00:08:06: %SYS-5-RELOAD: Reload requested
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Fa0/5, Fa0/6, Fa0/7, Fa0/8
Fa0/9, Fa0/10, Fa0/11, Fa0/12
Fa0/13, Fa0/14, Fa0/15, Fa0/16
Fa0/17, Fa0/18, Fa0/19, Fa0/20
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Proceed with reload? [confirm]
00:00:50: %SYS-5-RELOAD: Reload requested
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VLAN Name Status Ports
1 default active Fa0/1, Fa0/2, Fa0/3, Fa0/4
Fa0/5, Fa0/6, Fa0/7, Fa0/8
Fa0/9, Fa0/10, Fa0/11, Fa0/12
Fa0/13, Fa0/14, Fa0/15, Fa0/16
Fa0/17, Fa0/18, Fa0/19, Fa0/20
Fa0/21, Fa0/22, Fa0/23, Fa0/24
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1004 fddinet-default act/unsup
1005 trnet-default act/unsup
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Directory of flash:/
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3 -rwx 3110758 Mar 01 1993 00:06:29 +00:00 c2950-i6q4l2-mz.121-22.EA6.bin
4 drwx 4160 Mar 01 1993 00:07:04 +00:00 html
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375 -rwx 5 Mar 01 1993 00:08:05 +00:00 private-config.text
377 -rwx 1098 Mar 01 1993 00:08:05 +00:00 config.text
7741440 bytes total (2992128 bytes free)
Switch#
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I have an access switch (C2960S-48FPS-L) which is running on version (universalk9-mz.122-55.SE5).
This switch was running on VTP client mode and connected to distribution switch running on VTP client mode and vtp version 3, due to power failure the switch got reloaded and after reload it come to VTP server mode and all the vlans were deleted, but the SVI of the vlan and all other config was still there.
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sh vtp status
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Administrative private-vlan trunk normal VLANs: none
Administrative private-vlan trunk associations: none
Administrative private-vlan trunk mappings: none
Operational private-vlan: none
Trunking VLANs Enabled: ALL
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VTP Traps Generation : Enabled
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Number of existing VLANs : 5
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<>
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