autoselect currency not working reliably

Hi Team, I have some issues propably configuring Multi Currency plugin to work well along side with my store.

I am using W3 Total Cache and Cloudflare. It seems to create issues with pre selecting currency based on customer location.

If you can please help me to configure it in a way that I can maintain cache and cloudflare benefits that would be very appreciated. Thanks for all your hard work. Big fan of your plugins.