Microsoft's support article about Surface Pro screen flickering includes steps for confirming the issue. If it does confirm ...

For a force shutdown, press and hold the Power button for about 30 seconds until the screen turns off. Then, press and hold the Volume-up button and the Power button simultaneously for about 15 ...

If your Surface Pro 9's battery drain seems excessive and is accompanied by signs such as rapid battery drain, overheating, swelling, or failure to charge, it may indicate a hardware issue. In such ...