Electrical nightmare

I’ve got a 2005 Silverado 2500 6.0 and out of no where when I go over bumps or get on the gas the radio dies and the dash will flicker gauges will read zero every warning light will turn on I feel like it must be a ground issue and I have cleaned the grounds at the back of the block, driver front cab mount, and behind power steering pump, is there any other grounds I’m missing that I should clean and inspect