IOS 8 versus the Home Button

Starting day one using IOS8, I have had issues with the home button. Whenever I click "once" it pops up the app switcher. It is random, and frequent and annoying. After reboot it is "ok", but after use of the phone over a few hours, the apps begin to not close when the home button is clicked. The problem is progressive in nature and the phone becomes difficult to operate when the only option is to switch apps or scrolls left to the home screen and select an app.

Phone Info:

IPhone 5, purchased 2012

Upgraded to IOS 8 on go live day (dont yell at me....)

Have taken all updates and currently on version 8.0.2.

Have taken care of the phone very well, without any functional issues since purchase.

What I have done to "fix" the problem:

1. Soft-shutdown-reboot normally

Result: Fixes the problem for a few app openings. After use for a few hours, the problem occurs again.

2. Hard-shutdown-reboot

Result: Longer period of time before the issue returns. After apps are used throughout the day, will eventually become more frequent.

3. "Reset Trick" = (Open native ios app and hold home button until app crashes)

Result: Small fix time. Returns within an hour of use.

4. Set accessibility>home button click speed to slow or slowest

Result: No change

Other symptoms:

1. Apps are sluggish to open. Clicking home button does not bring up the lock screen quickly. Slow to load once issue has begun.

2. Banners are slow to go away or stick until acted upon.

3. IOS apps (native and otherwise) are slow to open in comparison to IOS7.

Possible causes:

1. Memory Leak of one or more apps

2. App switching not allowing for graceful memory allocation of apps

3. Sensitivity of button press set too high.

4. Other??

Any other ideas are welcome.

TIA

Jennifer