Health Monitor Invalid history version in header

I get a lot of these severe errors in db2diag.log:
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2008-10-23-14.11.33.865000+120 I1463721H437 * * * LEVEL: Severe
PID * * : 3960 * * * * * * * * TID *: 4232 * * * *PROC : db2fmp.exe
INSTANCE: DB2 * * * * * * * * *NODE : 000
APPID * : *LOCAL.DB2.081023121124
EDUID * : 4232
FUNCTION: DB2 UDB, Health Monitor, sqlmhMonCollHistReadHeader, probe:20
MESSAGE :Invalid history version in *header
DATA #1 : Hexdump, 4 bytes
0x0EA3EEF8 : 0000 000E * * * * * * * * * * * * * * * * *....
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Anyone knows what this is, and what I should do to fix the problem?
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Windows 2003 Server. DB2 9.5 Enterprise Server Edition + fixpack 1.
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Regards
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Odd Bjørn Andersen
ErgoGroup AS
Postboks 4364 Nydalen, N-0402 Oslo, Norway
Telefon +4723 14 50 00, Telefaks +4723 14 50 01
Mobilnr +47970 84597www.ergogroup.no