Is this possible?

[lowsound10]

So i been having some issues with my car lately. i will tell you what i have and whats done. i have pioneer avhp4000dvd headunit. 2 amps shitty amps, one amp has 20 amp fuse other has 30 amp fuse. i had the big 2 done ground to negative and positive of alt to positive on batttery with 0 gauge knu wire. i had 8 gauge wire running to a distribution block to more 8 gauge to the power wire adn 8 gauge for ground. i had my remote running from the headunit idk what gauge. and i have 2 runs of rcas from the back of my headunit to my amps. i have an re audio rex 12".

well recently my car has been acting up changed the battery yes its a bosch shitty one from pep boys but my stock used to run my stuff perfectly fine and i think the bosch is better supposedly, i was saving for a new battery. worked for a few days did the same thing changed the starter worked for few more days and did same thing at this point i was pissed. i took out my whole system amps and everything kept the headunit in there and now it seems to be working. just for the past day so far....soo is it possible my amps where drawing current even when the car was off? and why would that happen?

i also had a switch inbetween my remote wire, it was just a blue one that lit up but i didnt want it to light up so i didnt ground it. idk if anyone could help but its depressing going without any bump and i know people will say get a better battery but stock battery was runing it fine for like a year...ohh and i think stock alt is like 130 amps. 2008 mustang v6 is the car....if anyone could give some info itd be great or if you need anymore info itd be great too thanks everyone