Reply to Happy new year 2022

Hello all , I just bought a 5DSr body and a sigma 60-600 S lens and have taken about 40 pictures without problems – this evening I was taking of a kingfisher bird and the auto focus stopped working and now I can’t seem to get it to take a picture on any setting
I have tried everything – plenty battery life still – on / off / lens off and on ……. Just cannot get it to work and starting to worry , lens and body brand new
Hugo in Zambia