Things that I've tried since then with no luck,
-Set all the tiles to pixel perfect.
-Changed the camera auto scale from "Closest Multiple Of Two" to "Pixel Perfect".
-Changed the camera type from "Orthographic Size" to "Pixels Per Meter". and laid the pixel perfect tiles perfectly next to each other. (with 20 Pixel per meters, I laid the 60X60 tiles to be +3 meters away from each other in both X and Y direction)
And I still get the flickering lines between the tiles while the camera is moving, when the shader is set to Solid, If I change it to Blend, the lines mostly disappear.
If I add padding the lines turn to black.
Thanks.