I have this issue as well. I've connected my Helix to loop my Axe FX II (I know, heresy) as a way to get the max out of both units. So I use the AES digital ports to connect to the AXE FX.
But about every 15 mins or so (this is approximate, I'm not entirely sure how frequently, might be more like 20 to 25) there is a loss of clock - and the audio drops out for about 2-3 seconds. Which, folks, just plain SUCKS.
I really want the clarity and fidelity of the digital ports to get the most out of it. Connecting it via patch and analog loses the strength of the signal, introduces noise... Gah! I don't want to go there.
I've tried via SPDIF and it's the same - loss of clock.
I've connected my Kemper via SPDIF and there's no drop out there - from the AXE FX that is!
I haven't looped the Kemper in via SPDIF yet.
I see the February post re: this - but no follow ups.
Anyone heard anything on when this will be handled?