Mine about 115 hours without reboot by using wake lock manager, still tracking... a little bit of draining battery but it's ok no need to worry, it's about ~3-5% battery per day with normal using.
Wake-lock juz consumes 9% of xxx % of battery consumation of all Apps, the longer you use your phone the smaller the indicator will be so dont worry. Mine juz ~3% of all-day-use.
auto reboot occurs from 7.3.2 (the first 6.0 rom i installed) -> 7.5.6 and 8.0.2 too, .eu rom or global, china version, also Dev.. i think it's about 6.0 kernel. 2 days with wake-lock-manager my fone works well.. keeping tracking~~
tis a common issue on 6.0 based-rom on Mi4 bro, check page 36 we'r gonna find the way to temporary fix this, but being in-testing-progress.
https://xiaomi.eu/community/threads/mi4-lte-ramdom-reboots-with-logs.31938/page-36
I bros, i'm here to notice u guys that china stable 8.0.2.0 rom still has auto reboot issue. I juz updated a day ago and it happened right now. ****kkk~~~~~~~~~~~~~~~~~~~~~~