The methodical shift across a range of network addresses from which the login failures originate is a strong indicator of automation, commonly seen in attack patterns like credential stuffing. Attackers often use large sets of compromised username and password pairs against various user accounts to find matches. This pattern is less likely to be caused by user errors, which would typically not exhibit such precise changes in source locations, nor would they be expected to focus on high-privilege accounts specifically. Additionally, a configuration error or an issue with the authentication service would unlikely lead to systematic login attempts from changing network locations.