catching in neutral

Just lately my '99 zzr250 seems to be "catching" in neutral a bit. It was only when fairly hot but last coupla outings has been when cold. Also had its first "false neutral" suprise moment on monday.
Is this to be expected, or a sign of something dire?
I'm not losing sleep over it, but it is a little annoying. Would rather not have to have another service done so soon if possible. 

Is this to be expected, or a sign of something dire?

