2012 civic electrical

Hello… Would like a bit of information if possible. About 6 months ago the battery died on my civic. Had to get jump start and new battery. The fresher replaced the battery however, since then the display (radio) and normal door ajar and seat belt lights blink on and off. For example if looking at the radio/LCD display… The mileage and station might block off then back on. Then it might not do anything for a while then it does it again. Any thoughts?

My first guess would be the battery cables connectors were not cleaned when the battery was installed and may not be tight.