I have two strange problems with conversations, maybe someone has similar issues?

1. Opening a conversation with whatever contact, takes an awfull long time to load all the messages. ie. the screen stays black and after a while the messages pop up. This was not an issue when i had the device overclocked, so I assume its related with the speed of the device and the ammount of messages that need to be loaded?

2. Sometimes, sporadicly, a message won't confirm to be sended. I mean, usually if you send a text message, first you get the "outbox" symbol appear in the lower right corner of the message, when its done sending, the symbol dissapears and the time & date appear. However, the symbol stays there all the time. The contact does receive the message, replies and I can open his reply. The problem is only that when I close conversations and then re-open it, it won't load the messages. The only solution is then to delete the entire conversation with the contact and then the problem is gone..

any suggestions?