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UC540: System returned to ROM by error - a SegV exception, PC 0x801C6320


i'm a new member in this forum.

Please i have my router UC500 and reboot regulary. Below the message of sh stacks

Spurious interrupts: 1219

System was restarted by error - a SegV exception, PC 0x801C6320 at 10:40:19 PST Tue Apr 15 2014
UC500 Software (UC500-ADVIPSERVICESK9-M), Version 12.4(24)SB, RELEASE SOFTWARE (fc1)
Technical Support:
Compiled Wed 26-Aug-09 19:01 by prod_rel_team (current version)
Image text-base: 0x800200EC, data-base: 0x8328ABC8

Stack trace from system failure:
FP: 0x878350B0, RA: 0x8CCDF3B0
FP: 0x878350D0, RA: 0x80EBB5CC
FP: 0x878350F8, RA: 0x80EC3ED0
FP: 0x87835118, RA: 0x80D6B090
FP: 0x87835138, RA: 0x80D74C00
FP: 0x878354C8, RA: 0x80D8BDA8
FP: 0x878354D8, RA: 0x80D93880
FP: 0x878354F8, RA: 0x80E64CD8

******* Information of Last System Crash **********

The last crashinfo failed to be written.
Please verify the exception crashinfo configuration
the filesytem devices, and the free space on the
filesystem devices.
Using crashinfo_FAILED.

%Error opening flash:crashinfo_FAILED (File not found)

This router make Call manager + data, he crashes at times and can't have crashinfo file.

Please, how can i solve this problem