zuk z1, mokee 8.1 random restart or sudden reboot problem

zuk z1, mokee 8.1 random restart or sudden reboot problem
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#1

device: ham(zuk z1)
device sudden reboots while in standby mode. randomly reboots more than twice in 2 days, i have cleaned installed mk-8.1 only installed adguard. no idea why this happening. also happening in lineage official rom. only stock zui or cm rom runs without randomly rebooting.