hi,
since you are using glossy reflections use a "reflection_diffuse" node.
(Rendertree>nodes>Raytracing>reflection diffuse)
plug the phong into the input of the reflection diffuse.
turn off the reflection inside the phong node and turn them on in reflection diffuse.
adjust gloss, increase depth parameter.
p.s. the same applies to frost in transparency > refraction_diffuse