UPDATE: As reported earlier, Ryback reportedly has "nuclear" heat on him backstage in WWE right now. This has lead to his recent losses on TV, including one to R-Truth of all people. They've also scratched the storyline that they had planned with Heyman and Ryback.
According to sources, the heat is due to several issues as we noted in our original report (see below). In addition to those issues, Ryback performing Goldberg spots (such as the Jackhammer and the spear) during matches without getting clearance from officials first is another reason for the heat. WWE officials were not happy at all about this and confronted him backstage about it.
ORIGINAL: We reported last week that Ryback currently has heat on him in the WWE. He lost to R-Truth last week in the UK and last night he lost to The Big Show, which saw Show kick out of his finisher. There are said to be issues with his ego and attitude. Also, the company is not happy with Ryback's lack of progress in the ring. The angle with Paul Heyman was also considered a complete flop. We'll have more on this shortly.