Savings account advice / AIB online 7

Hi, I currently have some savings in an AIB online notice deposit 7 account. It is getting 2 percent interest as the ammount is over 10k. Why does the interest in this account drop from 3.5 to 2 percent when over 10k. I have never managed my money before, and was pretty clueless about it until recently. I have been looking at other options and it seems with most other accounts, the more money you deposit, the higher the interest rates.

If I was to withdraw all but 10k, would the interest automatically go up to 3.5 percent, or since it was a deposited as a lump sum, would the interest remain the same?

What would you recommend for the remainder of the money. Permanent TSB offer 3 percent AER on their online 40 day notice. NIB also offer 3 percent with their eSaver online account, reduced to 1 percent if you withdraw, but only for that month.

Basically I need some advice on what to do, as I know AIB isn't giving me the best interest.

I would like access to some of the money, but don't think I would need most of it for some time. Would a fixed term account suit me better then as they seem to offer higher interest? If so, what are some of the best options? I take it that its ok to have accounts with 2 different banks, again I'm new to this so sorry if its a stupid question.

Thanks in advance for the help