Blackberry 9300 Restarting
I had this issue and it was driving me crazy!
I eventually worked out what was causing the problem after trying all sorts including wiping the device, changing the handset - in the end it was the battery!!!
We have 9300's across the business and had several users reporting the same issue but it was completely random.
My device started doing it after I had it for approx. 3months, others did it right away and some not at all.
The issue is that it would appear that the battery is loose in some cases and moves when the phone is used which leads to the phone restarting like when you have removed the battery.
My fix worked for me and every other device and is very simple:
1. Take a business card and slice off the edge of it to the
thickness of your battery (approx. 5mm).
2. Take the back off your phone and pop out your battery.
3. Wedge the folded over card (so it’s double the thickness)
between the top of your battery and the housing in the back of the phone. The
battery will now sit more firmly in its place.
4. Trim any sticking out card and replace the back cover.
You will now enjoy uninterrupted service from your 9300!!!
I know this all seems like a 'Blue Peter' ask an adult for
assistance kind of thing but I promise you it has fixed all of our 9300's