Clutch Issue, intermittent on warm bike...

[BLD]

I finally managed to get my '13 XC300 out on some real trails for a shakedown ride and had a blast. On my third ride, after several different trails, I stopped to decide which trail to take next and while in 1st, clutch lever in, the motor loaded up and the bike started to creep, and stalled. I fired it back up in nuetral and the clutch worked like normal. The clutch lever has a little play and clutch usually engages with the lever most of the way out. This happened a couple more times over the next several rides (prevented stalling by just going for it) and there were also times where I'd slow for a tight turn (clutch lever in in 1st) and would feel the clutch engage most of the way in... None of the problems seemed consistent and they would go away just as quick as they happened.

I'm using Motul 10/40 and the clutch works like a champ when cold or after sitting for days. No grabbing, stalling or squealing. After some searching I saw some posts mentioning bad seals or a scratch on the clutch master cylinder. Sounds likely, but are there any other things I should check? I'll tear apart the master cyclinder to check for issues and bleed the lines within the next week.

Thanks.