I've been using the Fuji X-T2 and testing the Autofocus on a range of Fuji Lenses including the 18-135mm (Super Kit)
I noticed that while the Autofocus and continuous Autofocus performed very well generally there appeared to an issue at the long end of the Zoom range.
When using Continuous Autofocus with the 18-135mm lens zoomed out beyond 100mm the Autofocus failed to function correctly. It focused on initial shutter activation but did not attempt to maintain focus. When the lens was zoomed back to within the 18-100mm range the Autofocus began to perform normally. Odd.
I have contacted my friends at Fuji and will update once I hear back. I have installed the latest firmware for this lens prior to testing.