Restarting and no sound

I have a Blackberry Curve 9300 and it hasn't been working correctly. For starters it seems to keep restarting itself - sometimes with the normal BlackBerry screen and at other times the screen goes plain white until it has fully restarted. It does this without any warning other than the red LED turns itself on momentarily beforehand. It goes through periods where it restarts every 5 minutes but sometimes it is fine for around an hour. 
In addition to this, there is no sound whatsoever. The music won't play, the message alert sound won't play and if you attempt to ring someone then you can't hear the other person. I have tried plugging in headphones and putting the call onto speakerphone but the issue still remains.
I have taken out the battery, memory card and SIM multiple times and it hasn't worked. I have also tried pressing around different parts of the phone to see if I can reconnect anything that has been disconnected, but it still doesn't work. The phone hasn't been dropped or suffered any other form of trauma, this just spontaneously began to happen last night. Help?

Hi and Welcome to the Community!
I recommend that you attempt to boot into Safe Mode:
KB17877 How to start a BlackBerry smartphone in Safe Mode
It may take you multiple attempts to get the ESC key sequence (press/release/hold) correct, so be patient. When successfully into Safe Mode, see what happens.
If the behavior ceases, then think carefully...what happened just before this behavior started? A new app? An update? A Theme? Something else? Think carefully as the smallest change could be causal...and attempt to undo whatever that was.
But if the behavior continues in Safe Mode, then you may need to consider more drastic actions -- WIPE, OS Reload, BBSAK Wipe/Reload, and the "Bare Bones" OS Reload Process. To prepare, you should be sure that you have a full backup to your PC...please review the Backup link in my auto-sig on this post for instructions.
You may also need the use of these tricks:
KB10144 How to force the detection of the BlackBerry smartphone using Application Loader
KB27956 How to recover a BlackBerry smartphone from any state
http://crackberry.com/blackberry-101-lecture-12-how-reload-operating-system-nuked-blackberry
Good luck and let us know!
Occam's Razor nearly always applies when troubleshooting technology issues!
If anyone has been helpful to you, please show your appreciation by clicking the button inside of their post. Please click here and read, along with the threads to which it links, for helpful information to guide you as you proceed. I always recommend that you treat your BlackBerry like any other computing device, including using a regular backup schedule...click here for an article with instructions.
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