Windows 10 Search not finding apps and files correctly anymore

I’ve been using Windows 10 for a long time, but recently the built-in Search feature has started becoming unreliable. When I search for apps, files, or system settings, it sometimes shows incomplete results, takes several seconds to respond, or doesn’t find items that are clearly installed on my computer.

The problem doesn’t happen all the time, but it appears randomly during normal use. Restarting the PC can temporarily fix it, but the issue eventually comes back. I have already checked Windows Search settings, indexing options, and basic troubleshooting tools, but nothing seems to solve it permanently.

I don’t want to reinstall Windows 10 just because of a search problem. Is there a proper way to repair or reset Windows Search, rebuild the index correctly, or use another reliable solution? Any advice from people who have fixed this issue would be appreciated.