Ec250 Clutch/gearbox problem

[Banwen]

Hi all,
I was out on my bike and everytime I changed down the bike would lockup.
I managed to get it back into nutral twice and headed home, but the 3rd time it locked up and the gear shifter wouldn't move.
I got the bike home by splitting the chain and pushing �� I took the clutch cover and springs out and was left with the 30mm nut. As I turned this there was a release and the gears appeared back to normal. Any ideas why it jammed??
I put the bike back together and got her back into nutral.
Now the bike is slipping into gear while I push it down the garden in nutral. Any ideas?

I believe the problem was up at the master cylinder as I lost the screw and rubber boot and made a temporary fix until new parts come. ��
Now the bike is slipping into gear while I push it around the garden while In nutral. (bike not started)

Looking forward to hearing and learning.

Banwen