What are the exact message/s you get. One or two messages?
Sounds like it could well be a heat induced/related electrical issue. Either engine heat, or a bad solder joint/failing PCB component or bad earth. A poor electrical connection/solder joint can heat up when current passes through it, which in turn increases resistance, creating more heat and more resistance/heat...you get the idea. Also check condition of battery even though no battery/charging warnings.
This needs reading of fault codes without question. Get your Vida/Dice (or equivalent) or go to garage before attempting any repairs. Your instinct about ABS pump module is understandable given the fault conditions, diagnose it first. Clean all earth points between body/engine/engine loom under the bonnet (remove and clean) and battery earth to body.
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