I just put my antenna in a u-shape in the attic and have a better swr now so I was able to try the uBitX on 40m for the first time.
What I experience only on 40m is that while using WSJT-X my uBitX locks up and gets stuck on TX. All the shorter bands (30/20/17/15/12 and 10) don't cause this issue.
Running CEC firmware v1.095 with Nextion 2.4 display.
When the lock up happens I get the warning message "RIG Control Error, Do you want to reconfigure the radio interface" and when I look on the uBitX the TX symbol is lit.
I don't have any chokes on my audio cables and have been working on the higher bands without any problems.