I'm experiencing the same problems with iTunes, but I don't have Lilu or Shiki running on my system. I'm using an Asus VivoMini UN62 with the following internals: Intel Core i5-4210U (Haswell) running at 2.4Ghz, 16GB DDR3 1600, Intel HD Graphics 4400. I'm running High Sierra 10.13.1 with iTunes 12.6.3.6; I originally thought it might be an iTunes 12.7 thing, so I removed that and installed 12.6.3.6 (the version Apple released after 12.7 that includes the App Store), but I'm still getting crashes every few seconds. I can also confirm this isn't a storage location issue either: I've tried putting my iTunes library in the internal storage, on a USB hard drive, and on NAS, and it always constantly crashes.