Lots of different problems with my iPad mini

AAarrrgghh!

I am having SOOOO many problems with my iPad mini. It really seems like there's an evil gremlin living inside!!

For example: as I am typing this, sometimes it will change a letter from lowercase to capitals (and no, this is not my typo's!) this also happens when typing anywhere, in a search box, writing an email... Making it really frustrating and time consuming to enter any text, anywhere.

When playing games, sometimes, it just freezes for a few seconds and then just exits the game/app, and reverts to the home page.

the screen freezes even on the home screens, and I can't swipe even between the home pages. And sometimes the whole thing just freezes (I was trying to write an email yesterday and every five minutes the key pad just froze. Other times, the "keys" (or buttons) are showing that I have pressed them but the letters/text I have typed does not appear on the screen.)

It keeps just doing things of its own accord, eg; yesterday I was reading an iBook, and the camera noise went off! As if I had taken a picture, but I hadn't!

(See what I mean about the gremlin?!)

its lagging, freezing, making weird noises, won't do what it should do. It also takes a very long time to charge now.

I ALWAYS delete my cookies, and browsing history, and I recently had a clear out of all my old apps in a bid to clear some space. I have hidden the purchases in tunes and I have ensured that my auto updates are switched off.

But the deleted apps re-appear regardless!!

I Have also done a hard reset, several times and these problems are ALL still happening.

i Am reaching for the hammer as we speak...!

AND NOW....since I started compiling this post, It won't send any of my emails, they go straight to out is and when I try and look for the composed mail on my iPhone, they're not even there!!!

OH my goodness, I am sooooo mad!

WHats wrong with it?

I Think it might be dying but I cannot bear the thought of that! Especially as I can't afford a replacement.

(IS it possible to get a new battery put in? Coud that be the problem?)

ANy advice great fully received....