Slowness in Message or Email App

Hi everyone, I have a quick question about the Message /Email application on my Playbook 2.0.

I have noticed that it is suddenly taking a long time to open an email message and to delete email messages. They used to open and I could delete emails pretty quickly until yesterday.

I have not changed anything on my settings. I have checked for the latest update too. I also restart the Playbook twice each day (via the battery icon in the upper right corner).

Does anyone have any suggestions? Many thanks. :)