1.)Shutter does not release 2.) How to...

Question

1.) The shutter of my Camera quit often does block quite often in the midst of any session , seemingly without any reason! pressing the release a few secondslater - it's doing it! That happens with any of my lenses! By the way I am using most often a QUANTARAY 18-125mm 1:3.5-5.6 D (digital lens!) What could cause that??
2.) How can I get my Camera to shoot continuisly? What do I have to set "ON" and in which Menu or where? I can't find anything. But supposedly it can do 3 frames per second! I really would want to use that! But how?

Thanks for looking into that!
Werner