Hi, for Virtuoso users we have a dedicated mail support: support at volumio dot org
The mail support is better since we monitor it constantly, while on the forum we might not notice.
From what you say, it looks to me that this is the usual issue with ALLO USBridge…
Long story short: they need some special drivers, otherwise in some circumstances the transmission of data over USB drops. That’s especially evident with MQA because if its not bitperfect the decoder will turn on\turn off.