Grinding noise from the front axle

Hi! The warm season is up and I have a bad grinding noise from the front axle. It's somewhere right in the middle. Depending on the speed, there is this noise until it is about . 80 to 100 of the normal driving noises is overcome or is interrupted. Sounds really bad and now it's a permanent act. I can only get it off for a moment by shaking or very fast acceleration. Last year, the workshop said it was the differential at the front. I thought, there are some wheels slowly chipping off (that's how it sounds), but after oil changes on the part of the workshop there were no chips. Winter o.k. And now it's starting again. It's not a pleasure driving. Did anyone have a similar problem or suggestions about what it might be? I'm at a loss. Thank you. Sebastian