What Is My Country? IP Lookup Issue

Context: What Is My Country? Tool Facing Critical IP Geolocation Issues

I'm completely stuck and frankly, a bit desperate. My web tool, "What Is My Country? - Find Your Current Country & IP Location", which relies heavily on accurate IP address lookup, has been reporting inconsistent and often incorrect country data for the past 24 hours. I've been trying to fix this for hours, and it's impacting user trust.

The Problem: Inaccurate & Inconsistent Geolocation Data

• Users are reporting being shown the wrong country (e.g., US users seeing Canada, European users seeing US).
• This isn't just a few cases; it seems widespread and random.
• I'm currently using a combination of MaxMind GeoLite2 and a fallback API for IP lookups.

What I've Tried So Far (and failed at):

• Refreshed MaxMind databases to ensure they are the latest.
• Checked my server's IP (it's correct, not a proxy issue on my end).
• Verified API keys for the fallback service – they are active.
• Cleared all application-level caches.
• Reviewed server logs for any errors related to external API calls or database lookups – nothing obvious.

My Urgent Questions:

• What are the most common causes for sudden, widespread IP geolocation inaccuracies?
• Are there specific reliable IP address lookup services you'd recommend that offer extremely high accuracy for country detection?
• Could this be related to a recent surge in VPN/proxy usage, and how do you effectively handle that for accurate country detection without blocking legitimate users?

Any help or pointers from experienced developers or SaaS founders dealing with similar IP geolocation challenges would be a lifesaver right now. I'm waiting for an expert reply!