Software
If Software: If a stability problem (the system reboots, freezes, strange operations out of the blue)
a. Did you recently (in the past 7 days), make ANY changes to TrueNAS? This could be making Administrative changes, updating TrueNAS to a new version, open the computer to do ANYTHING at all, move the computer. There are many things that can cause a system to become unstable, just think hard about it.
b. Did you run a Memory Stress Test such as ‘Memtest86’ and did you run it for 4 complete passes minimum? And the results. (A failure here could be faulty RAM, Motherboard, CPU, Power Supply, or heat saturation in the system, or the motherboard BIOS setup incorrectly especially for over-clockers).
c. Did you run a CPU Stress test such as ‘Prime95’ for at least 30 minutes? And the results. (A failure here could be due to a poorly installed heatsink, Motherboard, RAM, Power Supply, or heat saturation in the system)
d. Is there an issue with the GUI? As always, be very descriptive with the problem.
e. Is there a Permissions issue? Try to be specific here as well. What is the problem and what are you trying to accomplish.
If you discover a software bug, file a bug report.