ABS and Brake lights blinking

[Andy5160]

Recently I started to have an issue with both lights blinking at cold start. Jeep is parked on a bit sloped driveway facing down. So I start the jeep and then drive like four feet so the wife can get in and during that drive lights are blinking and brake pedal gets soft and drops down but still holds the jeep. The minute I start driving it disappears and does not appear until the following morning.
many ideas?

 

[wjtstudios]

If I had to guess, it’s one of the batteries beginning to fail or a bad battery terminal connection

 

[Andy5160]

Thanks Bill
I’ll check the terminals