After the motor gets replaced I'm going to start searching for a Bosch powered motor. I like the Haibikes. Not sure about Yamaha motors though. I'm looking for a 28mph mountain bike.
I have a 2017 BULLS ESTREAM EVO 45 FS 27 28MPH that has about 2000 miles and the motor just died with that whining noise and no power.
Thankfully it may be covered by warranty, and Brose has been great with customer service, however, at about $1000 for a motor swap every 2000 to 2500 miles
there...