A software glitch has disrupted online transactions at nearly 300 banks across India for the past three days, primarily affecting cooperative banks. The National Payments Corporation of India (NPCI) suspects a ransomware attack and has temporarily isolated the software. The issue, linked to 'C-Edge' software by TCS and SBI, has caused problems with RTGS and UPI payments. Banks, including 17 in Gujarat, are awaiting restoration as the Reserve Bank of India works to resolve the issue.