Mates

So last Saturday after pushing START nothing happened. I could hear the fuel pump prime after turning the ignition on as usual then I heard what I think is the starter click/make a buzzing sound as if it was trying to turn but couldn't. I checked all the relevant fuses as per the owner's manual and found they were all intact. Battery is new and alternator checked out at 14.7 volts during idle. I did that test when I replaced my negative terminal with a new one. I kick started her and she fired up easily. After that when I push START she fires up as normal. What could have happened? Do I need to service/replace the starter? I put my hand up to the starter as best I could to try and feel if any wires were loose but I couldn't feel anything nor could I see clearly as its so tight down there without removing the alternator.

It used to grind now and then but it has not grinded since it started up again normally on Sunday. Any help, similar experiences or advice is welcomed