There is a new version of the
EVO 970 Plus Firmware available. The previous version was firmware version 2B2QEXM7, the new version is 4B2QEXM7. Unfortunately, I've been unable to confirm what the firmware does as Samsung does not provide release notes. However, when I tried to update the firmware, it reports that no compatible firmware was found.
I believe that might be because this version of the firmware is intended for the Elpis controller which is used in the 980 rather than the original Phoenix controller.
It is likely that this firmware will limit the write performance problems observed with the new Elpis, which drop drastically when the Intelligent TurboWrite cache is full. Samsung made this change of controller in the specifications of the SSD 970 EVO Plus to resolve production difficulties probably linked to the global pandemic.
It may also be simpler and more cost effective to produce only one controller for the 970 EVO Plus and 980 PRO instead of two.
The firmware for the remaining EVO 970 editions has not been updated yet.
So I guess we have to put up with the slow boot speeds and goodness knows what other general instability for a little while longer or do what others have done and changed NVME SSDs to another manufacturer.