That sounds like my experience with Windows 10 on my gaming PC. I only use that machine when gaming, and while it has a <10 second cold boot time (god I love NVMe), I prefer to leave it running and let it fall asleep after a few minutes of inactivity. Some time last week or so, I noticed it never cycles fully to sleep; it will fall asleep and almost immediately wake up. I'm positive this was due to a Windows update, as I haven't changed any settings on it before or after the incident first occurred.
Now, this is on a PC I built, but I used a common motherboard (Gigabyte Z170M) and never had this issue on my previous build, also based on a Gigabyte Z series board. My wife's computer is a mini-PC made by HP, and it started having the same sleep/wake issues during the same week. Something in a recent Windows update has affected sleep states.