You mentioned that the issue happens with both PAS and the throttle, so it?s probably not the magnetic ring, but it?s worth looking at. I have over 2000 miles on my RW4 and have had to clean off the magnetic ring a couple of times.
https://support.radpowerbikes.com/Maintenance_and_troubleshooting/Throttle_and_pedal_assist/Pedal_assist_system_(PAS)_troubleshooting_guide
https://support.radpowerbikes.com/Maintenance_and_troubleshooting/Throttle_and_pedal_assist/Pedal_assist_system_(PAS)_troubleshooting_guide