England fell apart in the second half against Scotland as a 31-0 lead was squandered with only a converted injury-time try salvaging a 38-38 draw.
Jones now plans to recruit an expert to work on his team's mentality.
"It's like we have some hand grenades in the back of a jeep and sometimes they go off when there's a lot of pressure," said Jones.
"We have a few of them and we've got to get rid of them."