Since last night, i've been having inconsistent performance from my keyless remote.

Unlocking is not a problem. I hit the unlock button on the remote, the lights flash twice, it beeps twice, and its unlocked.

When I push the lock button, it has either worked properly, or something weird happens. None of the lights flash, no beep, the car locks, and then it unlocks immediately after. If i wait a few minutes and try it again, sometimes it works like it should with the flashing lights, the beep, and the locking action.

I had 3 of 4 actuators replaced under warranty last year. Car is only 4 years old. Could this be the 4th actuator on the fritz?