Hisense TV 55U7HAU freezed after played 7 minutes with subtitles from iPhone's Storages and not display chinese subtitle it only shown square box.?

[Hisensetv55U7HAU]

hi, I bought Hisense TV 55U7HAU a few week ago when I play movies it start to freezed after played 7 minutes with subtitles from iPhone's Storages and not display chinese subtitle it only shown square box.?

please helps, thank you all expert out there for suggestion