iPhone 4S heats a lot during facetime usage

Dear Apple Fraternity,

Since the moment I excitedly updated my iPhone 4S(32GB) to ios7 I am facing the following problems :-

1. A lot of heat builds up during Facetime usage. I would rate it to ALARMING level.

2. Battery drains out real fast during facetime comapared to ios6

3. 3G data services has gone noticeably slow.

4. Phone abruptly faces session crashes.

5. Before 7.0.2 update, I was facing Phone-Hang problem also (for the first time since 4S purchase i.e. 25th Dec 2011).

6. Last I find my phone has gone slow, may be due to newer requirement by software for a faster processor.

All I want is to restore my phone to the last version of ios 6 as it was at least trouble free then.

My apologies for all ios 7 admirers.

Regards,

Raj