I HAVE some anomally in the shading near the buttons

Those are common shading errors. There could be a couple of reasons. I'm going with double vertices this time, so select all the verts in edit mode and M to merge by Distance. 

That's a 'conflict' of the Auto Smooth, where some Edges of a Face say it should be Shaded Flat and others say the Face should be Smooth Shaded.

You can for instance lower the (threshold) Angle in the Smooth By Angle Modifier a bit, or lower the 'inlay' Edge Loops around the buttons, or in Edit Mode, Select the top Faces that should be flat and CTRL+F > Shade Flat.

Other possibilities are 'double Vertices', as Omar mentions, or inconsistent Normals (SHIFT+N in Edit Mode, with everything Selected).