Bottom Line: Can more than one person confirm that 10.13.4 fixed the issue with the iMac Pro overheating while sleeping? I have a dilemma and need to choose between the lesser of two evils: the bugs in 10.13.3 or the newly introduced bugs in 10.13.4. Long version: I am running 10.13.3. Twice now, in the last 24 hours, my sleeping iMac Pro was blazing hot when I went to wake it up. The fans went to max capacity when I woke up the iMac Pro and the machine was extremely hot to touch. I seriously think touching the chassis could cause burns. This is not an isolated issue. Several others were having this issue on 10.13.3: https://forums.macrumors.com/threads/imac-pro-gets-warm-when-in-sleep-mode.2109470/ I have not had this issue up until this point. To work around this, I would simply shut down my machine when I'm done working, but unfortunately, Apple also introduced an unfixed bug on the iMac Pro when using SoftRAID, which is a piece of software absolutely critical to my workflow. The current workaround to get SoftRaid to work means that essentially, I need to keep my iMac Pro running or in sleep mode. Restarting the iMac Pro requires me to complete about 5 minutes worth of steps to prevent an endless driver install loop. Five minutes may not seem like a lot...but this my work machine and time is money. But now I can't seem to trust my iMac Pro in sleep mode for fear of it reaching temperatures of 200 degree without any fans running. If 10.13.4 definitely fixed the heating issue while sleeping, then I think my only choice is to upgrade to 10.14.4 and accept the new bugs that were introduced with that update, which are issues with the auto-brightness and increased system crashes, especially when waking up from sleep. These issues will pose problems too, but it may be the lesser of two evils. I hate to say this, but I am getting very frustrated with Apple. At this point, the iMac Pro is taking more time than it is saving. It is a beautiful piece of hardware, but on the software/driver/firmware side, it does not seem like it is ready for the pro market and Apple hasn't even acknowledged these issues or if a fix is on the way. Sorry for the mini-rant in this paragraph! Back to the topic at hand, has 10.13.4 fixed the overheating issue while sleeping?