Issues after iOS 11.x upgrades

Hi Team,

I am using iPhone 6s Plus on T-Mobile and after upgrading it to iOS 11.0.1 and further, I have started facing below issues. If anyone can help me fixing these will be of great help.

1. Battery drain: I have noticed battery draining quite faster and i have to re-charge at least 2 times a day.

2. Call Drop: After the recent 11.1.1 upgrade, i am facing call drop issue in almost every call. This is so annoying and needs a quick fix.

3. Voice drop: After first upgrade to 11.x, i have started facing voice drop issue during the calls, where the person speaking on the other end of the call is not audible. This also needs a quick fix.

If anyone can help me fixing these issues, that will be great.

Thanks,

Jazzy