Issue with Kickr v6 - only affects races

An issue has occurred during the last 2 races (first one was on 3/6 and then yday, 11/6, which only manifests itself during races. I am running the kickr v6 using virtual gearing and in race mode, but when I apply power (or stop applying power) it takes around 5 seconds to respond, either up or down.
This only occurs in races - for example I did a 40 minute ride yesterday morning with zero issues.

Has anyone experienced this and found a solution?

In case you haven’t seen the news, Wahoo’s June 1 firmware update for the V6 is causing all manner of problems. If you are on firmware 5.6.13, I suppose your issues could be related to that (though what you describe sounds a little different from the other reports).