FM Radio problem (crashes, loud hissing)

[ozzturkgem]

I have an xperia Z1 for a week ( BH90C, updated to 14.1.G.2.257). 

Normally FM radio reception is very good. However, If the FM application is in background and I do web search, twitter, e-mail or facebook, a very loud hissing sound starts and fm application crashes. If I force close application and restart sometimes application works normally sometimes loud hissing continues and it become impossible to change fm channel. To solve the problem I cleared data and cache of FM radio app (with the Walkman app there is no such problem) but it did not solve the problem. Problem was there before the 14.1.G.2.257 update and it is still there. 

Are there anybody else having the same issue? I can not decide whether it is a software or a hardware problem. Did you guys know a solution to this problem?

[ozzturkgem]

I made a factory reset. It did not solve my problem. I made a clean install latest update. Again no success.

I decide to give the xperia Z1 back to the seller. I will want refund and never ever will buy a sony phone again. They cannot even make a working phone. Today, phone started to produce weird sounds on phone calls.