I had (and still have) the same problem. I tried the suggestions of shielded cat5 cable (which made no difference), and ensuring that both sides were grounded (which might have made some difference but did not eliminate the problem).

I recently put in a Furman power conditioner which improved things greatly but has not eliminated the problem entirely.

Problem is that I don't just get drop outs. Sometimes its a nasty spike that damages my tweeters. My last hope is to try galvanic isolation.

I assume this is due to the Teleporter passing through (or perhaps creating?) transmission errors caused by transients in the power supply (which can be caused by an arc as a mechanical switch is turned off/on).

I am considering using an I2S-USB-I2S solution instead as it uses a transmission protocol with error correction which may resolve the issue - whereas I understand that the teleporter blindly passes through whatever it thinks it has received.

I had the same and it all came down to the grounding/ shielding.
It took me occupied for months.

I had isolated the WaveIO board too mutch but instead I had to use it's designated ground studs.

Please carefully review you grounding plan.