Apple says it's still investigating battery drain issues with the iPhone 4S after some users complained that the iOS 5.0.1 update didn't solve their problems. But now Apple is facing new gripes that the iOS 5.0.1 update is causing more problems with the iPhone 4S including; microphone failures, Wi-Fi signal loss, and cellular network reception issues, according to reports.

"The recent iOS software update addressed many of the battery issues that some customers experienced on their iOS 5 devices," Apple said in a statement to All Things Digital. "We continue to investigate a few remaining issues."

Apple released iOS 5.0.1 on Thursday, claiming that it would fix iPhone 4S battery drain. The update also added multitouch gestures for the original iPad and fixed a few other issues. While some iPhone users said the update solved their battery problems, others said the battery suckage was just as bad, or worse, than before.

Some users may never be happy with iPhone 4S battery life, because as I've explained before, smartphone batteries are fundamentally sub-par. But Apple is at least confirming that it hasn't completely solved the problem.

Meanwhile, some users are complaining of new problems with iOS 5.0.1. According to GigaOM, some users have experienced microphone failures, Wi-Fi signal loss and cellular network reception issues. A report from The Startup Foundry says the update is forgetting to list contact names when the user receives a text message or phone call. (A partial fix for the latter issue is available on The Startup Foundry's Website.) Apple didn't specify whether these new bugs are part of the "few remaining issues" that the company is investigating now.

On the bright side, whenever Apple does release a new patch, it'll be easy to get thanks to over the air updates.

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