I am now having the same problem.
I received the Sonic Port VX 5 days ago for my birthday.
Initially worked great with my iPhone 6.
Day before yesterday my iPhone updated to iOS 8.2.
Now I have the same problem that "eternalkeith" posted on 16 November 2014 7:30PM:
When I aggressively attack the strings, the head of the sound disappears, but later the end of the sound can be heard.
When I turn down the volume and play softly, it sounds fine.
I had a little over one good day with my Sonic Port VX; however, now I am not at all happy with it and wishing that I had opted for another recording device.
I am also not happy at all that it is pretty much useless with a PC as there is no included software comparable to Mobile POD. On the PC I cannot get it to record JUST guitar without it also picking up external sounds apparently through the microphone.
Relevant Info:
iOS 8.2
Mobile POD 1.7.2(872)
Firmware 1.0.11
DSP Engine 1.10.0
Is there a solution for this before I return it for a refund???