People are getting tired of Chipotle's menu and that could be more harmful than the E. coli crisis The burrito chain's sales have plunged following the E. coli scare Same-store sales dropped 26.1% in February following a 36.4% decline in the prior month The company's stock price has lost more than 27% of its value in the last six months But even before the E. coli crisis Chipotle was showing signs of decline