This is the same one I have and had worked perfectly fine until the recent V10 update. Now I see the slow warning as well. Unplugging it and plugging back in seems to clear it for a while so I think it's a software issue.I recently got this drive which is supposed to be fast and USB (Samsung BAR Plus 128GB - 300MB/s USB 3.1) https://www.amazon.com/gp/product/B07BPG9YX9/ref=ppx_yo_dt_b_asin_title_o05_s00?ie=UTF8&psc=1
Now with V10 and the rear camera, and partitioned with a Music Dir - it shows that the tesla cam doesn't have fast enough write speeds! even if I'm not playing music from the USB, Sentry mode doesn't seem to have this problem...not sure if it's a faulty drive or just not fast enough?