Shut down Studio then go into your Wahoo Fitness app. Run a spindown recalibration from there then unplug your KICKR and turn off bluetooth on your phone. Try to never run any Wahoo apps when using PerfPRO as trainers can get confused when both ANT+ and BlueTooth are controlling at the same time. Plug your KICKR back in and load up Studio. That usually takes care of the problem. You may also need to run an Advanced Spindown recalibration to solve the surging problem. Read more here.