we'll, I'm really pleased I posted this conundrum of mine, I know have a better understanding of where I might be going wrong - I have set up on the AF on button a toggle between the AF modes - Zone and expanded flexible spot small - so I'll switch that this morning to medium flexible spot/ and zone and give that a go - I concur completely that the small expandable spot which I've tried does grab focus on surrounding areas every time , and good to hear your confirmation of faster shutter speeds I had been using 1/800 for stationary after much trial and error, so will raise that slightly as well ( light permitting) and now I have a better understanding of the lens modes for stationary and BIF, so mode 1 stationary and either mode 2 or 3 for BIF, if I can remember to switch of course - I have AF sensitivity set to 5 - every day is a school day as they say - thanks for the input, appreciatedIf you don’t already have it set this way, change your AF sensitivity to 5 for most responsive. Medium flexible spot works best for me. Small is too small and expandable flexible spot is more likely to grab something next to your subject rather than your subject. Make sure the lens is on mode 1 for stationary subjects. FYI, if I want sharp photos on stationary subjects I use 1/1000 sec.