I can confirm that we are still actively working on the remaining causes of failure to resume from sleep. Our previous updates addressed some of the causes, and the last few are still being tracked down. As always, I cannot make promises as to when they will be resolved at this time.
However, even with wifi constantly on, your battery life should be considerably longer than 2 hours. I would suggest you should get between 5-7 hours when sleeping with wifi always on (which seems to avoid the resume problem). If you are sure there is nothing else going on on your device that may be consuming power, I'd suspect there may be a problem with the battery.
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