That is a symptom of earth wire issue, before spending a lot of money in other stuff try connecting a 3mm minimum copper wire cable and connect from battery minus to engine with the car off and key out of ignition, wait a few minutes and them get key to position 2 of ignition wait a few seconds and start engine, all the gremellins should be gone now , if it subsists go to fuse box on passenger side under the glove box take it out and with electric cleaner spray , clean fuses terminals one by one. And you should be sorted for sure.
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