Getting 'Pardon our interruption' message when attempting to scroll through search results.

Text:

'As you were browsing eBay, something about your browser made us think you were a bot. There are a few reasons this might happen:
. you're a power user moving through this website with super-human speed.
. you've disabled Javascript in your web browse.
. A third party browser plugin, such as Ghostery or Noscript is preventing Javascript from running.

Power user ? Been registered with ebay for 18.6 years & never been accused of that.
Have javascript running.
Unsure about any plugins haven't added anything lately.
Problem is the same in IE or Chrome - HAVE CLEARED COOKIES & REBOOTED.
No option to go through captcha.

Ebay - any suggstions ?