problem, need help!
 

So I have a problem with my phone and I'm not sure whether if it can be solve with a firmware reflash. My phone is a Sony Ericsson P1i.

Basically the phone freezes and turns off, then it resets. This always happens and sometimes during that period of it 'freezing', I can't receive calls or receive text messages. After it turns back on (it turns itself off), it doesn't pop up when I receive a text message so I have to go into the messaging screen manually.

I'm not sure what the problem is, but I've thought about how the firmware might be fucked up so I should go get it reflash, or possibly update it at phonemore.

What should I do? Help, comments needed!

(Yes, it's confusing)