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Hi Guys, 

I recently experienced a few weird issues with my IS250. When i start my engine and begin to drive around 1 minute in, the Nav and system seems to "Restart" and i will be able to proceed with driving with out any issues. Once i stop, the entire car will lose all power until i open up my bonnet or fiddle with the battery clips. Once the power is restored i am unable to start my engine and however everything else is functional. Once during the issue i stepped on both my break and throttle peddles to start the engin,e the other time i would simply wait for 5 - 10 minutes and the issue disappears. 

Any idea what's causing the issue ? 

I believed it may be my fuel pump fuse but all the fuses are fine. 

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Dirty/high resistance batter terminal connectors can allow low current flow with full voltage. High current flow drops too much voltage across the resistance and voltage drops to load causing issues. You already stated you fiddled with connectors. How about you take them off, clean up those and batt terminals and replace firmly.

Also take Neg off 1st and replace last.

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