I have a new husqvarna 445 chainsaw that I just purchased. I am having trouble with the chain seizing on the bar. I am using the correct chain bar oil and I grease the nose sprocket at every fill-up. I've been cutting green oak and it seems that chips build up in the chain groove and sprocket. I've tried looser and tighter chain tensions but doesn't seem to help. This will happen about every 3 ~4 minutes. I'm so frustrated. What's wrong?