Ion-icons, ionic-3

I’m not able to resolve the problem.
On ionic serve, the ion-icons are working,
But on build, it showing squire box,
i check that and there is no any font is being applied on it.
i also tried with font-family:“Ionicons” ,
but din’t work at all,
Please help.

Yes this problem does occur some times and at other times not.

Can i resolve it ?

Some times yes but some times no.

I resolve this issue,
i corrected the font path of the theme file.
$font-path: “…/assets/fonts”;