how can i fix my car alarm?

security was coming up on my mesages center off and on for about a month. last week i went to start it but it wouldn"t start, locked came up on the radio. I replaced battery in my remote, it took a whille but car eventualy started but security lights in car kept bleeking. I used key in door of car and they stopped for a couple of days. It happened again and i used key and it worked again for a couple days. Yesterday the alarm would not work at all for about 4 hours all of sudden it did. but inside alarm lights were bleeking again.