2006 Jeep Laredo starting problems

Welcome to the forum, I'd have to make sure the battery has a full charge and the battery connections are clean. I'd check the charging system. When the problem occurs, if it won't even crank, watch the lites, dash--dome--headlites-- something, with the key in the start position, if the lites stay bright, no reaction, sounds like an open circuit to the starter. I'd also want to check for voltage drop along the starter circuit.