Acuradams

I drive a 2005 acura tl with no navigation and when i changed my battery my radio went into "safe mode" and started asking me for a code. After finding my code that i confirmed with Acura is correct, i entered and my radio started working. Maybe 2 days later in the middle of a song it just stops playing. now my radio is completely unresponsive i can't even bring up the option to enter a code. Sometimes it randomly starts working again but it has been a solid month with no radio. i've checked the fuses and i've done the reset were you unplug the antenna but no luck. i believe it has something to do with the antitheft system because it only works when the anti theft light starts blinking. PLEASE HELP!!!