ok so past couple of days my transmission has randomly been locking itself into 1st, 2nd, and 3rd gear. it either locks itself in or locks itself out and makes me have to like rip the crap out of it to force it into gear. it happens sporadically

i was wondering if anyone had any idea what's going on with this. like is it the synchros? the forks? what?

also 3rd gear has been grinding randomly a little bit lately

 

shift fork or rail issue, and gringing is a result of bad blocker rings or meshing teeth for such on the gear hub assembley for the prob gear