Yes, since about November - as you wrote at the start of this topic, but it could have been present before then. I became particularly aware of it because of the Thanksgiving holiday. As of December 1st, it had been about 9 days since the Triumph-LS (J-Field v1.10.3.17463) was last on and when I had turned the LS back on: dead as a door nail.
Matt Johnson had commented that he had also seen the issue of abnormal power loss. Subsequently, I have done several experiments and reported the data to the developers, but that was back last month. I haven't had time to specifically test further for power loss issues though have been casually monitoring the battery meter.
Eitman's article isn't technical enough plus it's old. More research may reveal that there's some way to know absolutely when / if the WinCE machine can ever be truly off. Sounds weird, I know, but I wonder if the LS could actually be told to not suspend, but to really turn off everything.
One theory I have thought about for a long while but cannot substantiate, is a linkage between the increased power loss during times when the LS is off, communications - be they GSM or WiFi or both, and now, some OS wildcard. Part of this idea springs up from the intermittent failure to connect with WiFi upon first booting, sometimes as many as two or three times in a row. Forced power board updates haven't necessarily addressed this. My GSM experiments have halted because most of my tests have been related to UHF. Another part of this ideas arises from observing the behavior on my Android tablet where a quick tap of the power button still allows WiFi to operate in the background despite the appearances of being off. A longer press leaves the tablet completely shutdown... I so I think.