I have installed on P6s, P6as and a P7a. Haven't experienced such issues, except for occasional - fairly rare - time when a screen on my personal P6 wouldn't wake up after a tap, having to resort to pressing the power button.
I ascribed this to the brand of screen protector inatalled...
The other small-ish issue I have is a delay when taking a photo. It's about a second between pressing a shutter and photo being taken, tangibly longer than any other device I have ever used.
So nothing akin to OP's issues. Mine are easy to overlook and it would take a lot to dissuade me, plus my prior devices (mostly A∆∆!e) had their own quirks that drove me mad.
If anyone has tips to alleviate such quirks, please share.