stereo upgrade gone bad?

Hello All- Im new to this forum but am enjoying it greatly! I am in the process of installing an Alpine Iva-W205 touchscreen Dvd player in my '03 H2. Along with the indash I am putting in a Pac video bypass and a Pac steering wheel control interface so my factory buttons work. I am trying to accomplish this by using a Metra GMOS-04 converter (Crutchfields). I have also installed a Jl 500/1 amp powering a JL H2 Stealth box along with a JVC backup camera and headrest monitors.  I know, alot going on! After going through 2 Metra converters and checking a rechecking my wiring, I am still losing channels of sound when playing the stereo. It does not matter if its on radio, cd, or Ipod. When i turn up the volume to anything past half way, I lose sometimes the front speakers, then the back, then sometimes the front right and so on. There is no pattern to it. The funny thing is I never lose the sub though. You would think if it is a voltage problem, the sub would be the first to lose power.  My door chimes are also going off now and telling me my driver door is ajar when im going down the road. (the door is not ajar) Crutchfield has just sent me my third Metra and Im trying it tomorrow but i dont think thats the problem. The second Metra I plugged in caught on fire immediately and started smoking. Has anyone got any ideas? FYI, I had a former Alpine Tech guy check my wiring and everything is wired as it should. Am i just trying to add to much fancy stuff? Anyone else heard bad thing about these Metra Converters?