#2: Failing switches/routers
Many network slowdowns are foreshadowed by strange occurrences. For example, regular Web traffic may work properly, but e-mail may stop functioning. Or, regular Web traffic may work properly but attempts to connect to any secure (HTTPS) sites may fail. In other cases, Internet access simply ceases across the board.
Often the best remedy for inconsistent network outages and/or slowdowns is to reboot or power cycle the network's routers/switches. If local network connectivity exists (if users can view and access network shares) but they are not receiving e-mail from external users or cannot access the Internet, rebooting or power cycling the WAN modem can often return the network to proper operation.
If you're having to reboot or power cycle a piece of network equipment consistently, make sure that it's connected to a quality uninterruptible power supply. Power fluctuations often result in confused switches and routers. If a network device is connected to a good UPS and still frequently experiences trouble, it may be necessary to replace the failing switch, router, or modem.
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