No incoming mail on ipad with IMAP account

I have not been able to receive incoming mail from an IMAP account hosted by Network Solutions, and I'm not sure if the problem is on the client or server side. I am also not able to delete messages from the inbox. (I get a message saying "Unable to move message: The message could not be moved to the mailbox Trash."

I am sending and receiving emails from this account on both my iPhone and macbook without any problem. The iPad account is set-up exactly the same on the iPad as it is on the phone and macbook. The inbound port is set to 993, which is what it is automatically set to in the others even though NS says to set to 143.

I have tried deleting the account and reinstalling many times with no success. I also tried resetting the ipad to factory settings. This worked briefly and everything worked fine for a couple of test emails, and then I was back at square one.

There are a couple of things I've noticed. All my mail is in the inbox up until 9/5/13, after that there is nothing. If I search for a specific email and opt to continue the search on the server, the email is found and put in my mailbox (it is not there after deleting and reinstalling the account.) Also, I notice at the bottom of the folder bar where it tells you progress, last updated, etc. that when I am checking for mail, the status shows the downloading progress bar and the approximate number of emails I'm missing very briefly.

Any help would be greatly appreciated.