Notes/Domino 6 and 7 Forum : Error 0x143

After 2 weeks working fine, Domino R6 stops after few minutes working and I received error 0x143. I'm connecting to server using Notes Client 5 and 6 and log are displaying this....

INFO (0): terminated process [ nSERVER:0af0]
INFO (0): terminated process [ nevent:09dc]
INFO (0): terminated process [nReplica:0b58]
INFO (0): terminated process [ nRouter:0b04]
INFO (0): terminated process [ nUpdate:0b00]
INFO (0): terminated process [ nAMgr:07ac]
INFO (0): terminated process [ nAdminp:0a14]
INFO (0): terminated process [ nSched:0910]
INFO (0): terminated process [nCalConn:0a88]
WARNING (0): all VPool 8150 pools have been allocated
ERROR (20): Invalid DBLOCK end signature 0x07c7aee7 @259120
ERROR (44): unable to open file '"C:\Lotus\Domino\Data\memcheck_W32I_SWEB_04_22@10_31.dmp"' - (22) Invalid argument
ERROR (0): failed while analyzing/dumping process [ nSERVER:0af0] memory
ERROR (44): unable to open file '"C:\Lotus\Domino\Data\memcheck_W32I_SWEB_04_22@10_31.dmp"' - (22) Invalid argument

Please send the following files:

NSD Log : C:\Lotus\Domino\Data\nsd_all_W32I_SWEB_04_22@10_31.log

Any help?