Check your left and right fuel tank levels by opening the test in the instrument cluster.
Did you clean the Idle Control Valve recently?
Some electrical components, wires and sensors don't like getting hot but they are a challenge to locate. If you run various live data selections while you drive safely and not distracted, something may pop up when warm.
Materials expand and contract as well.
With the age of these vehicles, oxidation can affect relays, connections and wires.

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2001 x5 3.0 (sold with broken motor), 1990 e30 M3, 1991 318is, 2002 325i, 2008 335i Dinan stage 3 6 speed,