While the statute allows courts to excuse a default due to law office failure, it was not the Legislature's intent to routinely excuse such defaults, and mere neglect is not accepted as a reasonable excuse. A claim of law office failure must be supported by detailed allegations of fact explaining the failure," and vague, conclusory, and unsubstantiated excuses are unacceptable.
Wright v. Brooklyn Renaissance Funding Co., LLC, NY Slip Op 05584 (2d Dep't July 10, 2019)
Here is the decision.