Please help! I have been through a lot of threads on this forum
(THANK YOU ONE AND ALL!!) yet I haven't seen my problem addressed.

In the last few weeks, my 600 is doing weird things. During phone calls in the last 24 hours, my 600 has reset at least 10 times, it freezes (no response from screen or keyboard input), and when I hit a number for voicemail control, the sound from the key sticks (I end up listening to the blare of the tone until I reset.) I have done a soft reset more times than I can count.

I have not added any telephony apps. I just added a SD 256 card, and it behaves just the same as before the card.

Any and all advice is welcome!