1997 Plymouth Voyager alarm system disables and stops the car randomly How do you fix this?

I have the same problems with my 97 Grand voyager for about 2 1/2 yers. Normally, I disconnect the ground on the battery, and let the computer clear itself. Normally about 15 minutes. Just recently, that would not cure the problem, so I hit panic and open a few times and that cleared it. It is a very aggravating problem, and I wish I could come up with a permanent fix for the problem. I would like to disconnect the alarm system and just lock and unlock the doors manually. Anybody have any experience doing that?