Power locks operating poorly with key fob - poor range

I have a 2005 1.8t Jetta GLS wagon with over 133000 miles.

Problem: The key fob range is limited. I must use the key fob from no farther than three to five feet from the driver door in order to unlock, lock or operate the trunk with the key fob.

I have replaced the battery in the key fob.

What else can I do to solve this problem?

The electric trunk hatch opening motor seems to be sluggish as well.

Thanks ifixit community!