Besides a UPS which is a must You could check that no library contains mor than 32000 objects
and no file contains more than 32000 members. Even if this is the case for only a minute Your
machine goes haywire.
Did you check the power on/off schedule? (GO POWER; option 1)
I that doesn’t show anything, try getting a small UPS that will get you 10 -15 of munites.(also good against spikes and brownouts)
Try GO PROBLEM. Option 2 (Work with problems) may get you some information. If any problems are shown on the dates/times the machine shut down, someone from technical support will be able to interpret the information you get here.
I agree with Rudolf,
Check your logs, they will tell how the system went down. I’d also definately get a small UPS to eliminate the flickers, Check a couple of system values: 1. QPWRDWNLMT, 2. QPWRRSTIPL.
in addition issue the STRSST, sign in and check your system logs and alerts and if any part is failing.
Also, you might want to check if an electrician has been in the building recently. I worked for a company years ago, who wired my power outlet to the bathroom light, so every evening my system crashed.
Please consider your UPS unit. If the unit is no longer strong enough to compensate power gliches
you could experience the afore mentioned symtoms. I seem to recall experiencing the same a few
years back. The UPS was over four year old. We changed the batteries in the UPS and had peace thereafter.