I recently bought my first RD04 from 92. I’ve been happy wit it. A couple of weeks ago I went on a longer trip round trip app 400km. Both ways during slow moving traffic i expirenced that when the engine got hot, my clutch leaver went sluggish and did not bite before half pressed and thus did not complete disengage. This meant that I had to hold the brake in order for the bike not to move forward. At the worst the engine cut out. As soon as I got moving and the engine temp came down everything were back to normal. Is there anybody who have expirenced this or have an idea to what is wrong?