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I have a 2004 GS430 with 114K pampered miles, has always run great, no problems. It is lowered with BC coilovers. Recently, I had a new AC unit installed. Since then, several times at highway speed when I hit a heavy bump the whole electical system seems to turn off for about 1-2 seconds (AC turns off,, service lights come on, radio turns off, etc) then come back on with no problem.
Well, even though I had checked the battery, I rechecked it based on your feedback, and indeed, the negative terminal was a little loose. Seems to be fixed -- thanks guys!!!
I finally figured out the problem. My positive battery cable was slightly bent upwards and was making contact with the hood causing a s/t electircal short, not to mention burning the underside of the hood. Easy fix!