Yeah i feel you. And the crazy thing is, since you know about the sound, you hear it even better each time
True that, i just can't have the full experience while on safari with the music app.
It kind of ruins my music and safari experience alltogehter, although the rest of the phone is good.
And i hate it that i'm mostly on my phone browsing and listening to music and,
i can't just the problem erased.
I think i'm gonna do a backup to itunes/ send the jailbreak apps list to my e-mail,
backup my whatsapp and contacts to Icloud etc.
And gotta try that 8.1.1 factory reset as new..
if that fails i'm gonna revert back to 8.1 again with an clean install, test it and after jailbreak it.
And meanwhile if that doesn't work i'm going to call T-Mobile again for this issue,
or i can go to a Apple Retailer to get it exchanged.
Or i just sit with this problem and wait for more news regarding firmware issue,
this TLC NAND problem or whatsoever and see what brings next.