this is normal. my ex500 (same basic engine/tranny) does that. its pretty normal with a wet clutch, which is more often than not on motorcycles. the oil drains out and the clutch plates stick together. when you first start it up, there isnt any oil between the clutch plates, which is why the shifting is a bit grabby at first too. once you start moving, everything gets oily. when you have it in gear, clutch in, and its sticking, you can rock it back and forth a bit until it unsticks. id just leave it in neutral when i park personally.