I would lena toward the fuel pump relay since after the engine is warm it stalls..

what happens is that the metal contacts within the BAD relay get hot from engine heat and start to expand... thus breaking the electrical connections...

You have 3 options...

1.) Purchase a new one (~$110)

2.) Open it up and resolder (~$?)

3.) Call me a liar!

__________________
2006 BMW M5 "Heidi" @ 109,000 miles
2005 MBZ C55 AMG "Lorelai" @ 165,000 miles
1991 MBZ 300E "Benzachino II" @ 165,000 miles
1990 MBZ 500SL "Shoshanna" @ 118,000 miles

(On the hunt for a good used M103 engine as of 6/10/23, PM me if you have one to sell!)