drg650

Yesterday I did some deep water crossing. On my 2002 CR250R.I was going slow working the clutch. And I noticed half way across I was losing my clutch. Like it was losing adjustment. When I reached the other side. I pull in the clutch lever I could only feel strain on the lever when it was almost to the handle bar. So I pumped the lever a few times and it got a little better. And longer I rode the bike not in water the clutch went back to normal. Just wondering if someone had any ideas what It could be.