Charging at 6A instead of 40A

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The OpenEVSE was stuck at 6A (or 6.2A) charging rather than using the full 40A capacity. (See the sequence, below.)

(This seems unrelated to #812 because it occurred with and without any OpenEVSE timers, and in both cases with no other charge-limiting features besides system max 40A.)

Hardware: Replacement Electronics circuit board for Juicebox v2
Firmware: OpenEVSE 8.2.3.CGMI, OpenEVSE Wifi v5.1.2
Connections: On Wifi. No monitoring. No MQTT. No OCPP. No OhmConnect. No Home Assistant. No RFID.
Settings: No charge limits. Default state = Active, Three-phase = No, Service Level = 2, Pause Status = off, HTTP authentication = Disabled, Shaper = Disabled.

First day sequence (to the best of my memory):

1. Install the OpenEVSE circuit board. -> Charge rate defaults to 40A since that's the hardware's capacity and it's correct for the 50A circuit breaker.
2. Set up Wifi and time zone.
3. Set timers to disable charging during 4-9pm peak TOU hours.
4. Charge the Tesla. The Tesla is also set to wait out 4-9pm and it always has its own SoC charge limit. -> It started charging at 40A.
5. -> Charging paused at 4pm.
6. -> At ≈8:58pm the EVSE clicked and its LED switched from Cyan to Yellow.
7. -> At 9pm charging resumed but at 6A instead of 40A. The OpenEVSE and the Tesla agree on the actual charging current.
8. Toggle OpenEVSE to Disabled, then toggle it back to Auto. -> That didn't fix the charging rate. It finished charging overnight at 6A.

Second day sequence/experiment:

1. Delete the OpenEVSE charge timers.
2. Set Tesla to charge during 8pm - 4pm for this test, and with its own SoC max, as always.
3. Plug in the Tesla during 8-4pm. -> It waited until 8pm, then started charging at 6A.
4. Unplug and replug in the Tesla. -> Again charging at 6A.
5. The Tesla UI could pick either 5A or 6A charging current. -> The OpenEVSE must be signaling a 6A limit.
6. Disable Charge.
7. Restart OpenEVSE firmware. -> Charging at 6A.
8. Restart OpenEVSE Wifi firmware. -> Charging at 6A.
9. Reset OpenEVSE (on the Firmware screen).
10. Reconfigure OpenEVSE Wifi and time zone. -> Charging at 6A.
11. Disable Charge, then toggle it back to AUTO. -> Charging at 40A!!

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Is it known what gets the OpenEVSE into 6A mode?
Is there a reliable way to get the OpenEVSE out of 6A mode?