A883 2nd & 3rd question

don't mean to highjack another fellas thread but i have the same thing going on, pops out of 3rd gear when there is no load on the tranny but have also noticed that it doesn't seem to go into 3rd fully everytime so I was thinking it could be the shiftfork or worn shifter. I took my car out for a ride tonight and I couldn't get it to pop til about the 10th time I shifted into 3rd.

could this be from a worn shifter or 3-4 shiftfork?