E7440 "locks up" when charger is attached

I have a E7440 and I can reliably "lock up" the laptop by plugging in the charger.

I say "lock up" because the mouse and keyboard are unresponsive. However, I can get it work again if I use Fn+F1 to put the laptop to sleep and then hit the power button to wake it up.

It also seems that keystrokes entered while the unit was "locked up" were actually just queued up, and then after I wake up the computer they are acted on.

it seems that this posting kinda describes the problem I am having, except that removing the charger does not bring the computer back to life: (E7440 freezes with charger attached)

To summarize here is the scenario in which the laptop "locks up":

1. Start with the charger plugged in and running Windows 10
2. Disconnect charger cable from laptop
3. Re-connect charger to laptop
4. Laptop "locks up"
5. Unplugging the cable again does not unfreeze the laptop.

The same thing happens if I unplug and replug the charger from the wall outlet.