viper 791xv , 455g, 04 trailblazer

i cannot diagonse this problem i amhaving with a 455g module first of all lets start out, this summer i installed a vip 791xv in my trailblazer 04 i used the 555l and the 455G everything worked perfect. now my power locks dont work so there is something wrong with the 455g heres the catch though, i unhook the fuse to the 455g and then hook it up again and the module works for a random amount of time lets say 4-10 lock and unlockings. then it stops working all together until i pull the fuse out and hook it up again. PS. the fuse is not blown. i dont know what to think

you  check the ground connection.  Had this problem once turned out the installer that put the system in didn't pick the best spot to ground that thing.Cause I'm So white and nerdy...

First Class Certi-fried installer