remote starter/alarm problem

Hi I have a remote start/ alarm system installed on a Ford Explorer 4x4 1997,and I am encountering the following problems:

1) when I engage the remote start, it works fine, but before use to keep the lights on while on remote start mode, not anymoe

2) also it used to flash the lights, when the alarm goes off or when I choose the option of silent arming without the chirps, not anymore, I get the chirps when arming/dessarming, but not the flashing lights.

3) now every time the alarm goes off, the siren sounds for a moment and then stops, but the remote pager tells me that the alarm is active.

4) when in remote start mode, the  "4x4 low/4x4 high" lights keeps on flashing every a few minutes.

can anyone please tell what it could be?, maybe is only a bad relay or something?, your help will be gratly appreciated,

Thx.

mauricio