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The Internet itself is inherently unreliable. Your users will traverse multiple hops (many networks) before connecting to your servers at any provider, as will any external monitoring systems you put in place. Brief issues along the paths between them and your servers can and will occur. While the Internet as a whole is designed to route around problems, this doesn't happen instantaneously in most cases, although it can happen very quickly.

This is not to say that internal network issues won't happen at any provider on occasion as well, because they certainly will. No network is perfect, least of all the massive system of interconnected networks known as the Internet, and you need to accept and plan for this. To believe or expect otherwise is simply unrealistic.