Car stalls then won't restart
So my Volvo stalled when I was at a stop light, and would not
restart. It turned out to be the fuel pump relay because after
jiggling the relays I was able to get it home. Since then I have
gone to AutoZone and replaced the old relay with the most
expensive one they had.
Fast forward to today. I had been driving for about 30 minutes
various places, and I turned on some music. I do have a
subwoofer in the back and it's hooked up directly to the battery.
The music was quiet, and the bass was turned down. I notice a
sudden drop in power about a minute into the song (the sub
wasn't doing much), and the engine comes back. I pull up to a
stop light and after 30 seconds of being stopped, the car just
stalls. I could not get it started again and we had to push it into
a parking lot. The car still turns over really strong and I can hear
the fuel pump coming on when I crank it.
Could the sound system have caused the stall? Would that keep
it from turning back on?
Any help appreciated, thank you