Share your experience!
it's been a month i bought my Lovely Xperia Mini Pro. I love this little Powerfull one. but, 3 days ago i found he sleeps of death. i must pull out the battery to fix it. im no worry that day, but yesterday i found him die again. and today is the third moment. should i sell my phone?
could anyone here? even SE dont care 
http://www.sonyericsson.com/cws/support/mobilephones/downloads/subject/updateservice/w995?cc=gb&lc=e... Try running the SE update service on the phone, as it needs to be switched off anyway for this process.
As what Dr_Chris has mentioned, try Software Repair phone with SE Update Service, could be a software issue.
Not sure if your phone is updated, if not, probably it will be updated once you run SE Update Service.
Just make sure that phone is charged (at least 50%) and 'maybe' phone data might be erased completely.
Good luck.
I had the problem two times now with my SK17i.
Firmware: 4.0.A.2.335
OS: 2.3.3
Carrier: Orange
Gonna try the update service since I have also other problems.