If you don’t use any deepstream elements and only use nv3dsink for rendering with these three cameras, can it run stably?
Just like: v4l2 → nvvvideoconvert → nv3dsink
I still think it has something to do with USB bandwidth. You can refer to this topic first.
There are some GPU errors in the kernel log. Did you upgrade the kernel when upgrading JP6.2? In fact, we have only tested DS-7.1 on JP6.1. You can try to completely re-burn JP6.1.