Being a Q revision, it should have the upgraded hybrid-ceramic bearings (less likely to have noise issues), but will also have the inferior single lip rotor coolant seal (more likely to develop internal coolant leak). I would definitely check your speed sensor/encoder... The "Drive_Iso_Warning" message is indicating an isolation problem (likely in the Drive Unit), which can start to pop up when coolant starts to get in there. If that is indeed the case, the codes will come back as more coolant continues to leak, and it will only get worse as more time goes by... If the coolant gets to the inverter portion of the drive unit, there is a very high likelihood that the inverter will be destroyed, so it is important to know if there's a problem before that happens (especially if you want to try and have the drive unit rebuilt).
It's possible the isolation warning could be another component, including the battery heater. Just because it's working doesn't mean there's nothing wrong with it... There are ways to check the isolation of each HV component individually, but it is quite involved, and I would recommend having knowledge of working on HV components before embarking on such an endeavor. For "extensive" testing, some components (including the rear drive unit/subframe assy.) may need to be removed from the car.