Once It Worked, Now?
Network troubleshooting can be needed as any working environment can experience issues that make inefficient or not working the network connections, both inside and among sites.
For a long time your network worked fine, and made his job, but some day your company starts to see delays, unresponsive applications, issue with some external daily used websites.
No medical doctor cures itself
More than all other scenarios, it is relevant with troubleshooting, to refer to someone external to be able to find quickly the problem who is undermining your operations, as no one can be enough objective and calm to evaluate a diversion from what was working good for months, up to yesterday.
That is the reason medical doctors always refer to a colleague, where they need a diagnosis for themselves. Choose whoever professional you want, but choose it out of the company.