100-400 is not AFing anymore.
All started abruptly few weeks back.
It was an intermittent problem at first. Sometimes back to focusing once I remove the lens from body and reattach or play on / off with AF switch.
Camera doesn't seem to be the issue as it act the same with few other camera bodies too.
Before this I was able to manually focus at all rang but now I cannot focus anything farther than 5meter even manually. That is less than 5 meter, focusing ring rotates manually but gets stock at 5 meter and wont move any farther.