Erg dropping out and inaccurate cadence

My brother turned me on to Zwift a couple of weeks ago and I have really enjoyed it. I used to run regularly, but after an ankle injury I experience pain that caused me to stop. Cycling on Zwift has been a well needed and enjoyable replacement that doesn’t bother my ankle. I do have a couple of frustrations. One is that I use Erg during workouts, which is a very handy tool for workouts, but it drops out 2-3 times throughout the workout. Second, the cadence is really inaccurate, to the point that it has no utility. My cadence through Zwift reads in the 60s and have only been able to break into the 70s once. I use a Wahoo KICKR Core that is connected via Bluetooth to my MacBook Air. Using the Wahoo app my cadence is accurate. I did the software update to my Wahoo KICKR Core and have done spin downs. Any assistance on correct this would be appreciated.