Lights will flash on in the dash for just a second while driving down the road - abs, hill start, the red exclamation point, ESC. most often when in 4wd but also sometimes on pavement in 2wd. Then today radio unit blacked out and I got the red battery warning on solid as well as the ESC light solid. Jeep still drive fine. Turned it off and it restarted well with no error lights. Any ideas?