just read this off the fiatecuscan forum
"Go to Settings. There is a new setting below interface selection - KWP 2000 Timings. It is available for KKL interfaces only and has 4 options - Default, Optimal, Fast, Slow. Change this setting and try to connect again.
This setting is new in version 2.6 / 2.6.1 and it is related to the optimization of communication speed with some ECUs. It is now possible to read parameters from most engine ECUs with up to 900 readings per minute. This functionality is available only with KKL/VagCom interfaces.
This function, however, is not supported on all ECUs. So, you have to experiment with the settings to see which works best. Also, some of the faster settings cannot work properly on slower laptops."
might be worth trying
Rotherham is abit far for me but there is probably someone close that would help