My note 4 is doing the same thing since software updates. i.e. Lollipop update.  I have to turn my mobile data off and manually connect to home wifi. My phone use to hook right up immediately as I pulled into my driveway at home. Doesn't do that either. Have to manually connect to home wifi now.

I was on the phone last night first with Verizon, no change. Than with Samsung. Still no fix for this issue. The woman put me on hold to figure out what more to do, 10 minutes on hold she didn't come back. I hung up.  I do not trust these companies. Amazing, two weeks into data plan and already used over 2 GB. Never did that before.  A plan to get you to purchase more gigs or pay overages?  I need a fix or I am not going to accept this for either companies. Their problem, not ours