Hi everyone. I’ve got an an old Ademco keypad that has been here since I moved into the house 20+ years ago. Lately it has started sounding an alarm (even when the alarm is not set) and flashing a code 90. Sometimes it won’t happen for a couple months, and other times it will happen 3 times in a single week, including in the middle of the night (which is a treat). I’ve read that this code means “the system is experiencing RF interference”, but I have no idea what I’m supposed to do about that. Do I need to have someone come and in fix it? Can I turn that check off somehow? Should I just start looking at something new? I’m a complete noob and would love some advice.