I've also recently been using iOS 27.
Shortly after using iOS 27, I noticed that Standby functionally started intermittently breaking.
How so? Usually I place my phone on my magnetic charger, placing the phone on it's side while the phone is locked, which initiates Standby. I then go to sleep - Standby has been initiated at that time. I sometimes wake up to glance at the time and notice that the phone's display is off - Standby is no longer running.
When I notice this, I sometimes reach over and tap the phone, and that sometimes gets Standby to initiate again (waking up to this issue is irritating). Sometimes, this happens multiple times a night.
I'm currently running iOS 27.2.1 (I installed 27.2.1 last night).
Today, I woke up and Standby wasn't running. I reached over to tap the phone...nothing. I tapped it several times - still no Standby. As it was already 8 AM, I decided to get out of bed and commenced to troubleshooting the issue.
I checked the Standby settings. Every setting indicated that Standby should've been running (I'd made no changes to the Standby settings in over a year). At no point could I get Standby to work again. This was odd AF.
I then saw some folks saying that they changed to a different charging cable. I tried a different cable and tried again. Standby started working!
What the hell.
Why would a cable be OK one day and then not OK the next? Note that the cable charges the phone just fine - it's not broken at all. I'm unsure if the power adapter is wonky, but again, the phone and watch charge without issue. The adapter generates enough power to charge both the iPhone and Apple Watch without issue.
Note that there are a lot of complaints about this, as well, so it's not just me misdiagnosing things. Some folks think that this is related to iOS 27 bugs. I'm not yet sure if that's true, but I'll continue to investigate.
