ABS/No trac warning lights

I have a 2005 Century that show ABS and No Trac warning lights. I use an electrical cleaner spray (without lube) on the front passenger side ABS connector spraying male & female ends. The warning lights don't reappear and brakes seem to function normally.
Then a few months later the same warning lights appear, I repeat the spray and everything seems to return to normal again. This process has been going on for about a year.
Can anyone recommend anything beyond the spray that might result in a longer fix?

When you disconnect the harness from the sensor, and shake the harness, does water come out?

I didn't notice any water. The connector is mounted in a vertical position.
Thanks for the reply.