Sumatra PDF is a PDF, ePub, MOBI, CHM, XPS, DjVu, CBZ, CBR reader for Windows

Unresponsive after word search multiple times

The first few times was fast and precise, and then suddenly it became unresponsive and crashes after I click Find Next too many times.

The file has to be big, though, like over 50 MB or something.

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Best to report performance issues via sumatrapdfreader on GitHub and if you get a crash follow the instructions to upload the report there for a fix
Please confirm there exactly which version/variant/os you are using since there have been many past fixes.
However this does sound like Reduce pdf text search memory which is still open