My 2011 Nissan Altima Key fob works intermittently.

I have this strange issue with my 2011 Nissan Altima Key fob.  It works
intermittently.

Here's what I have tried:

- Replaced keyfob battery, twice.
- The same issue happens with my current key fob and the spare key fob.
- Try to reset Car computer by unplugging car battery for about half hour,
while leaving key fob inside car.  (not inserted)
- Try to reset keyfob by turning car on/off while leaving key fob inside car.
(not inserted)

Here's what works:

- The door button on the keyfob works maybe 90% of the time.
- The door buttons on the car works when keyfob is near.
- The trunk button on the keyfob works maybe 50% of the time.

Here's what doesn't work

- The trunk button on the car when keybob is near, doesn't work 90% of the
time.  I almost have to wave the keyfob around.  it works maybe 10% of the
time?



I'm not sure what the issue is.  Does anyone have similar experience?  
Please help!

Thank you all.