Are you going to solve the problem, or just reboot the server? This is one of the many places where IT professionals come into conflict with the business.
The technical expert wants to figure out what’s wrong rather than just wipe all the evidence and hope for the best. But as Tim Gorman pointed out in a comment on another post, that takes time and expertise.
Most systems are not so critical that it makes business sense to investigate the root cause, especially if a nightly reboot solves the problem. As a technologist, it grates on me to accept that a system doesn’t work well and that I cannot investigate further. However, as a consultant tasked with helping organizations maximize scarce IT manpower, I often find that recommending a simple reboot is the most practical advice.
Make sure you use your resources where it makes business sense.