Annoying gaps between tiles are stubborn!

Whenever I work with 2d game and Tiles... I always get these annoying gaps b/w tiles... I know there are many fixes for it but none worked for me and they act wierd....
I have one project and in it , I made a sprite mat with pixel snap and it fixed the gaps...
When I was refining the scripts, the gaps automatically appeared, and this time there were more(They were in vertical lines, I don't have an image). Then I reopened the project, it was fixed.... And after some time , they now appeared in grids...
When I disabled pixel snap, it fixed itself!!

But still not completely, when my camera follow the player, the gaps appear....


So, what is happening here, how can I fix this? I got anti aliasing disabled as well as compression and filter disabled....
Thanks in advance.

 

You can use a package called pixel perfect works perfect for this. If this doesnt work try this: