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I have transferred files to my SD card and when I insert it in My Sony Yendo, device is restarting automatically and does a cycle of it. Could this be an issue with the SD card? Unfortunately, I got to stop the formatting of the card when connected to PC. Could that be a cause of this issue?
Thanks,
Marcus.
I'm sorry to hear that MarcusKrishna.
It is possible that the memory card needs to be reformatted via the PC in order to correct the issue you are facing. I'd recommend following these steps to see if it corrects this for you:
1. Turn off the handset and insert the memory card.
2. Leave the handset powered off and connect the USB cable to the phone and PC.
3. Once connected, open My Computer on your PC.
4. Right Click Memory Card (which should be listed under 'Removable Disc Drives').
5. Select Format.
6. Ensure FAT32 is selected in the box which appears and click Format again.
Once the format is completed, disconnect the USB cable and power the handset back on to see if the issue is corrected. Please Note: All data currently stored on the memory card will be lost during this process.
Let me know how you get on 
Thank you so much.....:-) That really worked. My phone stays ON with memory card inserted.
Your answer has solved the issue with my phone.