At the most basic level it is not required for the computer to operate normally: However if you are having a problem then the computer is not operating normally.
IT is asking you to reboot the computer because it is going to do a number of things, mostly unload all the software currently running and copy fresh files into memory from the hard disk. A good percent of the time the error you encountered was an error in that running software.
From a practical standpoint this is likely to solve your issue, but it is also the first thing the IT team is likely to do unless they specifically recognize what is wrong and already have a fix, so it saves you time, and if the problem does re-occur it saves the IT team and you time by cutting to that chase.
Frankly computers sometimes do weird things, unless it is a repeating issue you need to restart your software, and then restart your computer before bothering IT.
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