FWIW, I have now realized that since the 5/24 updates, waking my SP4 in my SP3 dock is about a 100% fail scenario.
It *may* be possible to wake the SP4 outside the dock, and then dock it, but that's just not what I do - reasonably enough, when I get back to the dock at either of my desks, I dock it and then try to wake it up. I'm pretty sure this has been 100% likely
to fail since the last series of updates. Also, it seems that the first wake cycle outside the dock goes OK, but subsequent ones are more likely to fail.
The serious power management issues of the SP4 are still nowhere near fixed.
I guess I'll try a swap for the newest unit I can get, but I'm not at all hopeful that will work - probably just another lost half-week of productivity. IMO, there is absolutely NO point in ever swapping for a refurb, since they are 100% guaranteed to 1)
already have proven that they are broken enough to return, and 2) are almost certainly still using the original mainboard, which would have the original, flawed Intel Skylake chip steppings, unless the mainboard was replaced in the refurb process (near-zero
chance if the original lights up at all.)
It's worth noting that we still do not know that there even ARE improved or known working Intel chip steppings/revisions - the reports of working, newer SP4s are strictly anecdotal, and some of those have developed wake problems weeks later. I would feel
better about trying a hardware swap if we actually knew, for sure, and based on data, that there truly is a known good working, robust SP4 configuration, beyond a couple of "so far, so good" reports...