Originally Posted by: genevatouring 
I can confirm his issues. It started right after I updated to version 440.97 and it disappeared when I rolled-back to previous version, 436.48.
Just like him, the game draws strange graphics errors such as missing elements of a scene (looks like a mirror or blank water surface) and then raises that “low streaming bandwidth” error. Races will halt (which ruins them, because the car stops immediately) – the problems come-up usually after 1.5-2 hours of playtime.
I am playing in WQHD at max settings using an i7-7700K and an RTX 2070 Super. I’ve been using these settings since I own this card without any problems. This definitely seem to be related to that specific driver version. I’ve talked to people on discord servers facing this issue also.
There are no critical values/events reported by hardware sensors (using hwinfo64) during game play or right after this happens.
I have reported the problem to the Forza and Nvidia Support units.
GPU specific issue?..
Didn't encounter with GTX 1080 Ti, same WQHD (2560x1440) with every graphic setting maxed out except FXAA.
And "Antialiasing - Transparency" in the nvcpl is set to "4x (supersample)".
While you didn't mention your target frame rate... mine is set to 30 FPS. (which might be the cause)
Update:
Still cannot reproduce even had the game running for a whole night...
Edited by user Thursday, November 7, 2019 11:01:27 AM(UTC)
| Reason: Not specified