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LMR14203: IC switching off seemingly randomly

Part Number: LMR14203


I am running some LMR14203 chips with 40Vin, 28Vout, components as below:

I seem to have some chips that are switching off and restarting during operation (see switch off in scope trace)

I am relatively sure it's not a thermal shutdown event, and I don't think it's overcurrent (I am drawing about 150mA per supply). Have you got any ideas what could be causing this shutdown?