Well I know what your trouble is.

I guess none of us find out about this until it's finally a problem. Inside each door lock actuator, there is a small electric motor that drives it to function. Inside each motor is a resistor, about 9x7mm, & 1mm thick. It looks like a sheath of aluminum on a plastic wafer. They are in the motors the operate very much like a resettable breaker. If someone were abusing your door lock switch, like a bratty kid, they heat up and the lock actuators stop working until they cool down again. Over time they gain a higher and higher baseline resistance that they barely pass enough current to operate the locks. The warmer the ambient temp the higher the resistance. You've probably noticed they have been sluggish for some time.

Now, if you want to solve the problem quickly and have money to burn, have the actuators replaced.

OK, you've got a thousand dollars worth of door lock actuators, so let's get to the real solution.

The only other solution is to pull each actuator and cut off the glued on lids that house the motors and gears, remove the chips and replace them with a suitable conductive material. Many just cut and flatten a piece of solid copper wire from Romex. I did that. Works well. See this link:

https://youtu.be/j_MWPJPJgW8

Kind of a sucky job, but pretty much a permanent fix. Think of the savings and pull the trigger.