Mavic Air developed alarming rear drift after I did a couple of updates and IMU calibration

[Blaksony]

On Friday, I dusted off the ol Mavic Air, order some new props (arriving Monday) and performed some calibrations on both the Quad and controller. Now the quad has developed some really bad rear drifting as well as some side shimmy and twitch, it flys well enough, took it up in high winds to about 500m, was almost rock steady and keep its position overhead but near the ground the quad flys backward in a distressing manner, the Mavic DJI Go 4 isn't displaying any unusual errors or warnings, I have at least 15 sats connected but I do notice some kind of interference over my bluetooth headphones connected to my iPad that's connected to the remote controller, some kind of sound drop off at the same time the drifting and twitches start. Thoughts anyone? And what's the deal about those Master Screw low noise props, are they a thing?