Is your iPhone shutting down with 30% battery remaining? You're not alone.

Various Apple users have complained in recent weeks that the latest iOS update has caused their iPhones to turn off faster than normal.

You can see a sample of the complaints in this 13-page thread in the Apple forums (here), but the gist of what's being said is that, after updating to iOS 10.1 (or iOS 10.1.1), certain iPhone models are shutting down as if they are devoid of battery, even while their battery indicators say they have about 30% battery left.

When these iPhones are plugged back in, they quickly jump back to that 30% mark.

The conditions of the issue seem to vary. The complaints suggest the point of shutdown could be slightly higher or lower than 30% and that the iPhone 6s, the iPhone 6s Plus, the iPhone 6, and the iPhone 5s have been affected.

Earlier in November, Apple announced a free battery-replacement program for users experiencing “unexpected shutdown issues" — suggesting the problem is hardware-related — but it said the problem affected only "a very small number of iPhone 6s devices" manufactured from September to October 2015.

As a result, only a select number of devices are eligible to receive a new battery. (Be sure to check your eligibility here). With more than just iPhone 6s devices seeming to suffer from unexpected shutdowns, though, there's a chance that some iPhone owners are stuck with a faulty battery, with no apparent fix for the time being.

It's worth remembering that grumbles over iPhone battery issues are nothing new. An endless array of factors could cause a phone's battery to behave strangely, from buggy apps to hardware stress to basic user neglect. Some users have reported similar unexpected shutdown issues with iOS 8 and iOS 9 updates in the past, too, so again, we can't say if iOS itself is specifically at fault.

Still, while most iPhone owners don't appear to be affected, iOS 10 has not been immune to bugs since its public release in September, and there at least seems to be something worth noting here.

Do not set the date on your iPhone to January 1, 1970, unless you want a phone you can't use anymore.

There's an ad-like meme going around, designed to look like it's from Apple, telling people that if they set the date on their iPhone to 1/1/1970 and then power off/power back on the iPhone, then it will present with an Easter Egg...a theme that mimics the classic Macintosh look.

People who are claiming to be in the know say that this is a prank, like charging your phone by putting it in the microwave or waterproofing it. This prank will "brick" your iPhone. (Make it unusable).

As cool as this might look, it’s a hoax, and a particularly nasty one at that. Resetting your phone’s date that far back will so thoroughly confuse your phone or tablet’s operating system that you’ll either need to take it to the Apple store for a replacement, or just buy a whole new phone or tablet.

The date bug affects iPhones, iPads and iPod touches with 64-bit processors running iOS 8 or iOS 9. Apple says it’s looking into the bug. Users can protect themselves with a series of tweaks, such as manually setting their time and date, not enabling automatic time changes, and not turning off their iPhone or iPads.

Here's a screenshot of the meme: