Strange Problem - DNS Cache Poisoning?

I agree with Steffen, this sounds like malvertising as the most likely cause, with a less likely option being compromise of the visited site with embedded redirects.

Running ad-blockers and script-blockers is effective against most malvertising, but can negatively affect your browsing experience.

Sometimes malvertising is targeted at only certain browsers. I used to have a site I visited regularly that suffered from frequent malvertising on the mobile version. Switching from Chrome to Opera solved that problem entirely. Ads still loaded (I wanted to support the site) but not the malicious redirects.