Does the R7000 have the Quantenna 5GHz battery drain issue or has it been fixed?

Hi, I'm looking to upgrade my WiFi router and I'm considering the R7000, but don't want to buy a router that drains my phone battery when it's connected to the 5 GHz channel and can't see any point in upgrading if I end up having to stick to the 2.4 GHz I already have.

I've experienced the issue recently, when connected to TalkTalks new router (from Huawai) and got fed up of waking up to a dead phone every morning.

I've done a bit of googling and found that the Quantenna drivers lacked support for powersaving negotaition at 5 GHz so has this been fixed. So far I've only found a reference to the R7500 having this problem. So does anybody know if the firmware has been updated to fix the powersaving?

Thanks