Isn't he carrying an injury? I've noticed that he has some strapping on his shoulder so that might be a contributing factor.
Also, the fact that he's teaming with Hernandez means that Chavo has to do the majority of the work in the matches, and at 42 and after the amount of years he's put into the business, that's a tough ask, especially if he is indeed carrying some injury.
Or, you could have the WWE fanboy answer: "When did Chaco get so sloppy? Since he went to TNA I'd say!!!! HUR HUR HUR!!!"