RX2800 i2 ILO rebooted on its own

These messages were found on four out of five RX2800 i2 ILO

system 1:

24    ILO             2  408022AE00E1002C 0000000000000000 ILO_IS_BOOTING

                                                           27 Apr 2018 09:28:15

25    ILO             2  408022C600E1002E 0000000000000000 ILO_RST_REASON_WATCHG

                                                           27 Apr 2018 09:28:15

system 2:

2     ILO             2  408022AE00E10002 0000000000000000 ILO_IS_BOOTING

                                                           28 Apr 2018 04:36:43

3     ILO             2  408022C600E10004 0000000000000000 ILO_RST_REASON_WATCHG

                                                           28 Apr 2018 04:36:43

system 3:

15    ILO             2  408022AE00E10018 0000000000000000 ILO_IS_BOOTING

                                                           26 Apr 2018 18:17:16

16    ILO             2  408022C600E1001A 0000000000000000 ILO_RST_REASON_WATCHG

                                                           26 Apr 2018 18:17:16

for fourth system I do not have output and fifth system did not exhibit problem.

So far I have not been able to find anything w.r.t to ILO reboot due ILO_RST_REASON_WATCHG.

Systems in question did not have power outage at all, operating system has been running just fine. Os is OpenVMS V8.4 by the way.

ALL ILOs are connected to a private lan segment with no "network access" to rest of world.

Any advise appreciated

_veli