Track shopping behavior funnel

I need the shopping behavior funnel for the last two months: product view, add-to-cart, begin checkout, and purchase. Show counts and conversion rates between each step overall and for mobile vs desktop. Export the funnel counts and a short note on any step with conversion below 5%.

Before I share the funnel with the product team, make bottlenecks obvious: surface the weakest step as a headline metric, show the percentage drop and absolute user loss, list the top three product pages with the biggest drop-off at that step, and call out suspected UX causes such as missing CTAs or slow pages. Suggest one quick A/B test to validate the fix.

The funnel shows a sharp drop from begin checkout to purchase on mobile this week. The engineering manager says checkout code wasn’t touched; our payments vendor reports no outages. I can’t tell if this is a gateway decline, a form validation bug, or a spike in fraud declines. What is the likeliest diagnosis and what two logs or reports should I request now to confirm it?

Over the past six months we chase a new funnel leak every sprint and run short A/B tests that never stick. I need a pattern change so we stop firefighting and start fixing root causes. What recurring measurement and decision habit should we adopt so we identify the real persistent bottlenecks and assign clear owners for fixes?