Corrupted file perhaps? I can't really tell you. I never had any problems with gateway or rxtools since i never used them. But It could be corrupted file, Bad memory card or maybe even system NAND. Either way if you do happen to start using luma CFW and experience problems. You can ask the noob paradise for help or the person who made fbi installer if that what you were using.
Why not just update your emunand to eradicate that as a potential issue anyway? There isn't a reason not to. I mean regardless if it works for 30 mins in Gateway and 5 in ReiNAND troubleshooting requires the simplification of problem identification by process of elimination, not hit or miss suggestions. Do what @Quantumcat advised before assuming the outdated firmware isn't your issue.