Microsoft said it’s working to fix device crippling issues in its troublesome Surface line, including one that plummets the processor clock to speeds not seen since the late 90s.

[Image: Reddit user JohnMichL]

Surface users are also reportedly experiencing issues with their Wi-Fi not being able to connect to 5GHz networks since the latest update at the start of this month.

A Microsoft spokesperson told TechRepublic the company is aware of the issue and working on a firmware update to fix it.

Reddit posts going back as far as a year ago reported CPU speeds dropping to 400MHz on Surface Book 2 and Surface Pro 6 devices.

It’s believed the issue is being caused by the BD PROCHOT Intel CPU flag, designed to prevent processors overheating.

The flag is designed to pop-up when components get too hot, but a bug is causing it to stay on for Surface users, dropping their CPU speed to practically unusable levels.

Previous Surface devices have been hit with a variety of issues including GPUs disappearing, displays flickering, and devices going to sleep and not waking up.