I received my Beelink Mini MXIII II (S905x, 2G/16G Beelink label and Beelink boot logo) last Thursday and never had any boot issues on this box. I'm not running kszaq's Jarvis build 220.127.116.11 on this box but kszaq's Krypton build LibreELEC-S905.arm-8.0-devel-20161223194610-r25062-g308adcf.img.gz which share the same kernel. Processor temperature reading is always normal. The only problem I have with this build is pixel shifting that makes subtitles unreadable. Android firmware version on my box is 108M0. Processor revision is 020a.
I had another box Mini M8S II (S905x, 2G/8G) bought 5 months ago and running the same build, also no boot issues. The same build could rarely boot on my M18 or MX64 (both S905, Android firmware version 106L1).