MHFU multiplayer camera keeps spinning

[Cotastraphe]

I'm having issues with the camera (using right stick) in MHFU when using 3 instances playing on the same computer over WLAN. The camera will occasionally keep spinning after you have stopped pressing it, but you can stop it by pressing the other direction (sometimes it spins that way then though). This also occurs in item selection sometimes when you scroll up or down and it keeps scrolling. I'm wondering if it has to do with the performance of the game because it doesn't happen when only 1 instance is running. Is there any way to improve the performance of MHFU?

Thanks in advance.