We planted a little shore pine about 9 years ago. It's grown into a big, wonderful tree...but...now it looks like it might be sick or have some pests bothering it. A few branches have needles turning brown and falling off. The end of the branches still have green needles. It is definitely not normal. I've tried searching but thought I could get a faster answer here? Any ideas? Is there something I can do that might address any pest that might cause this. I love this tree and don't want to lose it. Thanks for your help.

Jacque