my dad has an 05 GC laredo 3.7 V6 2wd, every so often when driving on the highway, the dash cuts out completely. all the gauges drop and the gear selection display turns off. then after a few seconds it comes back on and its fine for a few weeks. when this first happened, we replaced the battery, but it still does it from time to time. when the dash cuts out, the radio and blower will stay on. not showing any codes. whats the deal?