Warm and rain are when the issue crops up? Are you running the A/C when the issue happens?
I had an issue in December when a brake duct was interfering with the A/C pressure sensor, and it basically killed the engine while throwing useless fault codes. It doesn't sound like you have as bad of an issue as I did, but if you're under the car you should be able to see the sensor and wiring.
The sensor is right behind the passenger fog light, so it's low enough that it might be getting wet while you drive. Or you might be getting condensation.
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