2008 Grand Prix Phantom Electrical Issue

boomer25

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Greetings all. I am looking for assistance in diagnosing and fixing an issue with my 2008 Grand Prix.

The car is a base model 3.8L V6 (`131K miles) which has run well until recently.
Briefly described, there is a seemingly sporadic, random electrical issue where power cycles throughout the car; as visualized in the dash instrumentation, stereo, clock, and HVAC. There is a momentary (1-5 second) loss of engine power, which occasionally results in a complete vehicle stall. No codes have reported since I started tracking the issue. The failures are sporadic, occurring 1 to 5 times per day for several days then not occurring for a week. This occurs whether warm or cold, at any range of speeds except idle, and in varying weather conditions.

In troubleshooting the problem, I have cleaned the battery connections and replaced the battery without effect. I have taken the car to my local dealership, who have acknowledged the issue but can not get it to repeat with sufficient regularity to diagnose the cause. I initially considered it to be a short in the turn signal indicator stalk but recently have replaced that component without effect.

Thoughts and comments appreciated.
Apologies if this has been addressed elsewhere and I have missed it, there were some similarities with other postings but enough distinctions for the new question.
 
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has anybody looked closely at the engine compartment fuse box including the bottom of it for any loose connections, corrosion, etc. Has anybody checked the battery ground cable at it's actual termination point, not the battery end. Has anybody looked at the BCM connector for loose connection/corrosion?
 
The battery connections have been checked and are clear. I will work through the others and provide an update.
 
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