Share your experience!
I am using Xperia Sola for about 4 months.
At times,while listening to music, when a phone call is recieved the media volume and the ringer volume
just got muted.And nothing cant be heared untill the phone is restarted.
Please help me. 

Tell us what's your sola's Android version 
Settings > About Phone
Its GB 6.0.B.3.184
I suggest that you try to run a software reinstall using SUS.
http://www.sonymobile.com/gb/tools/update-service/
If the problem still remains you should contact your local support team, to have the phone examined and fixed at an repair center.
http://www.sonymobile.com/global-en/support/contact-us/contact-info/