2008 s80 3.2L loses power
 

I drive a 2008 volvo s80 3.2L, recently developed an issue, where while driving, all the warning lights suddenly come on, but the car still drives and moves but once parked and I switch off engine the key fob wont eject and the car wont start, the wipers keep working without me turning them on ... Nothing else works.
its the second time its happened, the first time I tapped the fuse under the glove box compartment(passenger's side). But now that's not working.

Following: I have similar problems with my daughters car. Most recently car completely died, no power at all. I disconnect battery & tested it fully charged, Re-attach battery, everything back to normal & started fine but cuts out after a few seconds completely dead again.

This is a possibility:

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