I *know* this doesn't help you, but it reminds me.
I did the washer/standoff fix, had a name, I forget. It too lasted for about 4-5 months. Night of Halo3 it dies. Master Chief streaming back down to EARTH and PIXELLATION everwhere!
I attempted to reflow with heat gun. After about the 5th try with moderate success but reoccurring graphical glitches which turned into 3RROD in between, I EXPLODED CAPS RRRRVYWHERE. and that was the end of my christmas day premium.
now I have a Falcon I replaced it with.
My ADViCE TO YOU. Do NOT throw away that Xbox360, even IF you blow caps doing crazy things. It is worth something. (If I had kept mine and had a little more patience, I may have been able to resurrect it. Meaning $$$ for Jtaggable console.)
Just some advice. Hang in there. When you are about ready to THROW it
, take a break/go to bed. I shouldn't have junked it. I COULD have at least used it for a live box. (Also, cover well with Tin foil.)
You might try get a modded reflow oven, or a locked in heat gun stand with WELL WELL covered caps and plastic. I think you actually do like cloth, plastic wrap, then tinfoil. Whatever. But stick with it, even if you buy a replacement arcade in the meantime.