The Miz's current losing streak is mainly down to the fact WWE's top officials are blaming him as the fall guy for the poor WWE Survivor Series pay-per-view buy-rate back in November. The main event of the show was The Rock & John Cena vs. The Miz & R-Truth.
The Miz has not won a televised singles match since the December 5th edition of RAW and his stock has been lowered in storylines in recent weeks. At one point The Miz was to get a big push and come back into the WWE Title picture around the WWE Royal Rumble time (there was talk of The Miz vs. CM Punk for the title, but the slot eventually went to Dolph Ziggler) but the Survivor Series numbers killed any chances of that.
November's Survivor Series was estimated to have garnered 260,000 buys worldwide, with 160,000 coming from the US. Those numbers were up from Survivor Series 2010 (244,000) and Survivor Series 2009 (235,000) but were nowhere near the amount that WWE had been expecting for The Rock's heavily advertised first wrestling match in seven and a half years.