Bad index errors in SAPDB 7.4.3

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I am periodically seeing the following database errors:

2008-10-03 00:48:56 --- Starting GMT

2008-10-03 00:48:56 7.4.3 Build 032-123-068-842

2008-10-09 16:54:06 0x435C ERR 54111 MOVE HGG05.1:

1[1024]->1[1024] len:-19180

2008-10-09 16:54:06 0x435C ERR 53250 B*TREE BAD INDEX 121874

(ROOT)

2008-10-09 16:54:06 0x435C ERR 51080 SYSERROR -9041 BD Index not

accessible

2008-10-15 13:33:04 0x7C2C ERR 18431 MESSAGES Could not write to

event log, rc = 31

2008-10-15 13:36:14 --- Starting GMT

2008-10-15 13:36:14 7.4.3 Build 032-123-068-842

2008-10-15 13:50:33 0xF4 ERR 18431 MESSAGES Could not write to

event log, rc = 31

2008-10-15 13:53:13 --- Starting GMT

2008-10-15 13:53:13 7.4.3 Build 032-123-068-842

2008-10-15 22:44:06 0xA40 ERR 54111 MOVE HGG05.1:

1[1024]->1[1024] len:-13824

2008-10-15 22:44:06 0xA40 ERR 53250 B*TREE BAD INDEX 916325

(ROOT)

2008-10-15 22:44:06 0xA40 ERR 51080 SYSERROR -9041 BD Index not

accessible

Does anyone know what might cause this and how to avoid it?