I tried to jump start my 2003 LS430 a month ago. Put connection on battery wrong and blew some fuses. Had them replaced and everything seemed to work fine. Now the power to nav , time temp power goes off and on. Works perfect when power is on then goes off from time to time. Normally works in the morning for a while then goes on and off after I start driving for a while. I think it is loose wire or connection by fuse. Which fuse should I check? any suggestions. Taking in tomorrow to lexus but afraid they will just want to switch out computer and will be very expensive. Please help