Year , they wear out ... brushes are prob down to the armature..
the wack just gets them to make a temp contact... it will continue to screw up...
The reason I mentioned this remote starter possible in an earlier post is cuz you said you had heard the solinoid click a few times ... the NSS switch does not feed the starter solinoid directly, but rather through an NSS relay..[ up behind the dash cluster]... so, a bad NSS itself is not usually accompanied with a clicking starter sol, as it only trips the relay primary contacts...
The usual complaint on NSS is turn the key to start position and get NOTHING.....
so, that was a tip off for me.........

See ya