An enterprise network has been experiencing erratic performance issues that have been difficult to diagnose. Network administrators have noticed that certain routes within the network become intermittently unavailable, leading to packet loss and increased latency. This behavior is sporadic and does not correlate with any specific network changes or patterns of usage.

Upon closer examination, it was observed that the issues coincide with rapid changes in the status of one of the network interfaces, which alternates between up and down states frequently.

What is the most likely cause of the intermittent route availability and the associated network performance issues?