Looking for help to solve front cigarette lighter intermittent problem. When I plug in a accessory unit it will work for 3-4 days, then stop working for no apparent reason. Checked lexus owners club website for solutions of problem, tried solutions, no help. I have 12 volts at cigarette lighter plug, checked fuse ok, but replaced anyway. Both rear cigarette lighters work fine. Has anyone ever replace cigarette plug in unit, easy or hard item to replace, what steps must you take to replace unit. Thanks for your help, Ron