IOS 6 Buggy and Slow hot to downgrade.

i recently updated to IOS6 the yesterday and it it running really slow on my iphone 4s also the phone is hot when running apps. maps is not working properly and text messages are failing and talking a long time to send/recive.icalled apple to be told they do not support downgrading and to take my phone in the store and see what they can do.i went into the store they said the hardware is fine it seems like its just ios6 causing the problem they told me warranty does not cover software issues and said they cant do anyhting about it they said to wait for ios6 to be updated or to downgrade using a 3rd party software but they then said if i downgrade i lose my warranty.so im stuck with a phone that is not working properly and apple refuses to do anything about it what should i do?