I am also having the cutting in/out problem with my 6S+ IPHONE. I am on 11.3 IOS version. So looks like no fix for this correct? When connecting to Audirvana + on the Mac, The DSD 256 is not highlighted. The highest is DSD 128. I thought the Q1 MK2 supported up to DSD 256 natively. BTW: Has anyone compared the Fiio Q1 MK2 to the SMSL IQ DAC/Amp?