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Question: theft electrical issue!!

I have a 2005 chevy malibu classic run an drove great no problems i love the car last week it randomly wouldnt start, got it home tried the 10 min theft reset because the light was flashin, didnt work frustrated i took the battery cables off an left it overnight. my bf hooked up the next mornin and started right away, no issues. yesterday again it randomly would not start acted like battery was dead. jumped it and it started so i took it home. half hour later i went to leave and nothing no lights. hooked it up to a battery charger(said fully charged) and tried to start, all of the gauges go crazy, the lights flash, there is a pulsating buzz sound under the hood, the trunk pops open and the door dinger goes off.sometimes not all at once its very random. im gna try a diff battery but my bf thinks its serious electrical and im still buyin this vehical it is all i have HELP PLZ