Troubleshooting · Plain-English answer
You share your VPN server's IP address with many other users, and websites judge addresses by their recent behaviour. If anyone on that address triggered abuse detection, everyone gets challenged. CAPTCHAs are the site double checking you are human, and switching servers moves you to an address with a better reputation.
Anti bot systems score every visiting IP address on its recent history: request rates, failed logins, scraping patterns and past abuse. A VPN address carries the combined history of everyone using it, so an address that one user hammered with automated requests an hour ago greets you with a challenge now.
Data centre address ranges also start from a lower trust score than home broadband, because most legitimate visitors arrive from residential connections. Neither signal says anything about you, which is why the challenges feel so arbitrary.
Switch servers when a site turns hostile, since reputation attaches to the address rather than to you, and less crowded servers tend to test cleaner. Staying signed in to sites you use regularly helps too, because logged in sessions rely less on IP reputation.
Completing one challenge usually buys a quiet session, so it is worth doing properly rather than reloading. The CAPTCHAs are an honest cost of sharing addresses with strangers, and the privacy of blending into a crowd is exactly what you gain in return.
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