I was using 4k2k 60hz video resolution on my philips Android box awhile ago but the option has disappear leaving me with 4k2k 30hz, 4k2k smpte and 1080p 60hz resolutions.

Anyone know what's the issue? I've not update anything, been using the same cable same port which previously supports 4k2k 60hz on my 4k TV. Any help would be appreciated thanks :)