I have a 96 PF that I have owned since the summer of 2001.  When I
bought it used from the dealership, it didn't have either of the key
fobs.  So, I ordered two of them off eBay and programmed them just
fine.  Over the years, I have only used one of the remotes and the
other sat around as a spare.

Just three days ago, I started having some strange things happen with
my car.  Sometimes the "lock" button does not work from the remote.  I
replaced the battery, but that has not fixed it.  I came to learn that
when I have problems with the "lock" button on one remote, I have the
same problem with the other remote.

Observations:
* The "unlock" and "panic" buttons on both remotes seem to always
work--I can lock all doors from the interior power lock switch and
successfully unlock all with the remote.

* When I am having problems with the remote "lock" buttons, I have
noticed that using the remote "unlock" button will not cause the
interior dome lights to come on.

* Sometimes the factory security system has spontaneously gone off.  It
happened three times yesterday while I was at work and one night while
at home.  (Two of those cases, the key fob wasn't even in my pocket or
near anyone to accidentally press the panic button.)

I don't know if I need to do something to reset the security system or
keyless system or perhaps there is a flakey relay somewhere or maybe
something going on in the computer.  Just looking for some ideas of
things to look at or try (other than an exorcism for my PF).

Thanks!
Randy.