Exactly. There's two main groups of people who report the problem:
1. Those who charge at 48a every day and one day notice their car has been charging at 32a.
2. Those who charge every day at 32a, then either install a wall connector or try some higher powered destination EVSE and discover their car can't charge at more than 32a.
People in that first group are more likely to discover the problem while under warranty, so we don't get them here crabbing quite so much.
We get so many in that second group that it begins to look like plugging into the higher powered EVSE caused the problem, but what has really happened is that it's been broken for some period of time and they are just now finding out. There's really no reason to believe the EVSE caused the failure. In fact, it's almost impossible for it to be so. A wall connector is just a fancy switch that connects the power from your utility to your car. It can't send the wrong voltage or really do anything that would blow out a PCS module.
Now they CAN be misconfigured and charge at a lower rate than expected, or a bad connection can cause overheating which can make the wall connector back the car off to a lower charge rate, but that doesn't damage the PCS, and we are generally able to quickly figure out what is happening (the presentation is a bit different) and help the person get it fixed..