A person familiar with the situation said theres no indication Sony is pulling out of a deal.
CNBC also cited Sonys volatile stock price, as well as ongoing challenges in linear television.
The joint offer would also face regulatory scrutiny on several fronts.
Paramount studio lotAaronP/Bauer-Griffin/GC Images
The shares have been buffeted by deal speculation all year.
Its deal would see Skydance acquire Redstones controlling stake and pro-rated number of shares help by other stockholders.
Paramount would go private.
Sony and Apollo, meanwhile, would buy in the company for cash, taking it private.
