I upgraded my memory with a 32GB Class 4 Sandisk micro SD and the upgrade all went fine as described in this thread but I have had an issue since.
When I open the keyboard and then close it, the device often cuts out as if it has lost power. It doesn't go through the "Goodbye" close down, just a straight off, as if the battery has been taken out. This doesn't happen every time. I'd almost swear it happens when the phone has been on for a while, it doesn't happen when I have just restarted it after it crashed the last time.
I have tried shaking the battery to see if it is loose and it is not. I have tried shaking the phone and hitting the side to see if it is a result of the impact of the screen closing but it is not.
When I turn it back on, enter SIM pin etc. then all the sites in IE require their logon again so it's not just as simple as turning it back on.
Of course the warranty is voided by my having changed the memory card.
Does anyone think the two are connected or can anyone suggest any fix?