Shares of RBL Bank came under free fall on Monday as investors' sentiment got a hit after corporate governance issues surfaced at private sector lender. The RBL Bank shares dropped as much as 20 per cent to hit fresh 52-week low of Rs 138 after its managing director and CEO Vishwavir Ahuja went on a sudden medical leave following Reserve Bank of India's appointment of Yogesh Dayal as an additional director on the bank's board. Meanwhile, the bank has appointed Rajeev Ahuja (existing executive director of the Bank) as the interim managing director and CEO of the bank.