When using a Kodi remote app on iOS I have found that 3 out of 4 apps I have tried are hard crashing UHD mkv (remuxes) playback when either seeking or skipping forward/backward. Hard crash with the sad face icon and then a full reboot.
The apps that crash the Vero are Kodi Remote (v1.5.7 iOS), Smart Kodi Remote (v.1.3.1 iOS) and 10Muse (v.3.31 iOS). The only app that does not seem to hard crash the Vero is Sybu for Kodi (v.3.40 iOS)
These apps do NOT crash any other Kodi fork on any other hardware (Shield, PC, Zidoo).
I am running Vero 4k+ on OSMC May 2019 2019.05-2 with no other add-ons at all.