unc0ver v3.0.0~b49 was released to fix all known stability issues on iOS 11.0-12.1.2 and more

04/06/2019 - v3.0.0~b49 was released for public testing with the following changes:

• - Fix overnight reboots or system memory resets triggered by mmaintenanced
• - Fix freezing under low-memory conditions on iOS 12
• - Fix freezing when loading tweaks or when securityd is being restarted on iOS 12
• - Fix a kernel memory leak
• - Fix a faulty sandbox patch
• - Store offsets in the live kernel memory
• - Optimize the code
• - Improve the success rate of machswap and machswap2
• - Don't reboot after extracting bootstrap
• - Fix a bug in logging
• - Improve performance
• - Improve assertion
• - Update the APT lists cache file for repositories

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https://github.com/pwn20wndstuff/Undecimus/releases