Starter Solenoid problems of the 2011 Toyota Highlander

The electric door locks have failed again for the third time. I have had all 4 door locks replaced, some twice, at considerable expense. The driver's door lock and the driver's-side rear door lock are now broken again. The driver's door lock does not operate electrically at all again. This means I must pull the mechanical key out of the key fob to unlock the door. When the car is placed in drive, the driver's door remains unlocked, as does the driver's-side rear door - a serious safety issue since they are supposed to lock automatically, and they will not lock manually with the electric door lock switch located on the driver's door - I have to manually push the door lock lever mechanically. I am very disappointed in Toyota. The problem lies with the cheap solenoids/motors that are used to actuate the door locks - a device that costs less than $5 on amazon, but is difficult to install for us non-mechanics. I have heard of the same problem happening with other car manufacturers as well.