Hello, I’m sure this has been asked but i cant seem to find a thread or post about my crossfire troubles.

I have a 2004 crossfire that has been having battery issues. I have replaced the battery February 2018, and after a few days of the car sitting, the car is dead. I have a sony aftermarket stereo installed, its been in since 6/2015. I don’t have corrosion on the post, and have recently disconnected the negative cable for a cleaning, and to clean around the ground connection area. At times my car key fob wont unlock the doors. I use the key to open the vehicle and i find out I have battery life but the cars silent alarm goes off, and the car wont start. When this happens, i disconnect the negative cable for a minute and reconnect it, this fixes the issues of the alarm being triggered and the car starts as usual. I have had my alternator and starter tested, they both come back with zero issues. Another issues i have encountered is when the car is running at night, the dash lights dim and flicker as if the car wants to die out. Any help would be appreciated, thank you crossfire community!

2004
81,000 miles