Dell 8940, 11th Gen i7--same GD thing here...basically ever since I've had the computer and updated to W11. Active window functions normally but everything in the background will be unresponsive, including the taskbar. Happening more than a dozen times/day and seems to be especially prevalent after updates. The only way I can 'unlock' the background is by opening task manager and then cancelling. Then it will mysteriously get less frequent for a while. Still can't find a solution and it's annoying asf. It's far more likely to lockup when sitting idle, but regularly happens when I'm working too..