I will say the random opening of the trunk is actually a touchy FOB. Probably have the FOB in your pocket and sit down and when you come out, the trunk is open. I had the same problem and to resolve this, I installed a 2 shot trunk release. Once installed the trunk will no longer randomly open on you. I will take you hitting the open button 2 times for the trunk to release. I installed and no more problem. Do a search on this forum and you will find many people have encountered the same problem. All you do is replace a relay in the fuse block that requires 2 "hits" to open the trunk.