In its free repair announcement post, the company said:

“We have investigated claims of screen cracking on Surface Laptop 3 and have determined that, in a very small percentage of cases, a hard foreign particle may cause a hairline fracture in the glass that may seem to appear unexpectedly or without visible cause.”

The company is encouraging those who’ve experienced the issue to contact support and initiate a repair free of charge, so long as the device is still under warranty. (Since the model is still pretty new, that shouldn’t be a problem for most people.) Microsoft also says it will reimburse those who’ve already paid for a repair.