If your spreadsheet stops autocompleting entries after row 574, the problem is almost certainly not a formatting glitch or a corrupted file. It is almost certainly a gap in your data. Excel's Autocomplete works by scanning the non-blank cells directly above the current cell in the same column. When it hits an empty row, even one you didn't notice, it stops scanning and stops suggesting. The user's experience, described in detail on Reddit, is a textbook case: 574 rows of consistent data, then a break, and suddenly the feature vanishes. This matches patterns we see in other common spreadsheet frustrations, like the silent errors hidden in bank statement imports that we covered in Three quick checks that catch hidden errors in bank statement imports. In both cases, the spreadsheet appears to be working normally right up until it isn't, and the cause is something the user never touched.
Our take is direct: do not hunt for a toggle. Do not reinstall. Check row 574 and row 575 for an empty cell in the column where autocomplete stopped. If there is a blank, fill it with any value, even a placeholder, and the suggestions will return for the rows below. This is not a bug; it is a design constraint that becomes invisible until you know it exists. The same principle applies to formula ranges and dynamic reports, as we explored in Troubleshooting Dynamic Report Formulas for Accurate Data Pulls. A single empty cell can break a chain of logic that the user assumes is continuous. The spreadsheet is literal: it only looks at what is there, not what you intended.
The deeper issue here is that traditional spreadsheets treat data entry as a manual, cell-by-cell process. They do not learn your patterns or adapt to your workflow. The user in this story typed "baseline" and "follow up 1" hundreds of times, and the software offered a shortcut only as long as the column remained physically uninterrupted. That is not intelligence; it is a fragile heuristic. An AI-native spreadsheet would recognize those recurring entries across the entire document, regardless of blank rows, and offer suggestions based on the semantic context of the column, not the mechanical position of the cursor. It would see a pattern and offer it, not wait for a contiguous block of filled cells. This is the kind of transformation we talk about when we discuss smarter approaches to pulling data, like the technique described in Pull sales data across sheets by date range with a smarter spreadsheet formula. The goal is to make the tool work around your data, not the other way around.
So what should you do right now? First, locate the blank cell in your column around row 574 or 575 and fill it. That restores autocomplete instantly. Second, ask yourself whether you want to keep working in a tool that stops helping you the moment your data has a gap. If the answer is no, start exploring solutions that treat your entries as patterns, not positions. The specific takeaway is this: Autocomplete did not break. It revealed the underlying limitation of a static grid. The fix is simple; the lesson is worth acting on.