2014 LEXUS RX Structurebody Problems

My front passenger door actuator has failed. This door cannot be locked/unlocked with the remote or by pressing any lock/unlock button. This prevents the driver from being able to lock all the doors or the front passenger from being able to quickly exit the cabin unless the manual unlock switch is known and applied. This is the 5th door actuator that has failed on this vehicle. I'm the original owner and it has 51K miles on it. All 4 doors failed and this is the second time for this particular door since it was replaced some 4 years & 21K miles ago. The problem started a few months ago and is currently intermittent. Being "sometimes" safe is not being safe. I have not had it analyzed at the dealer since I would not bring it there unless I planned to have it fixed. There were no warning signs or lights.