Revolve get stuck on render a video in 4K

I did a project with DaVinci Resolve Final V15 with about 100 short videos and approx 400 picture and several audio tracks. Everything went well exact some smaller issues, but there was a workaround every time.
The timeline (UDH resolution) is now 15 minutes long and I tried to render a video.
Rendering works fine for Full HD, but it get stuck when doing the same in UHD (4K) every time on the same item which is a fusion text title. I used different output formats and quality settings without any different where Resolved get stuck. Basically it could be a file limit of 2 GB about with lower quality setting the file size was about 1.8 GB.
Does anybody has an idea how to get a rendered video in such a painful situation?
Regards,
Christian
The timeline (UDH resolution) is now 15 minutes long and I tried to render a video.
Rendering works fine for Full HD, but it get stuck when doing the same in UHD (4K) every time on the same item which is a fusion text title. I used different output formats and quality settings without any different where Resolved get stuck. Basically it could be a file limit of 2 GB about with lower quality setting the file size was about 1.8 GB.
Does anybody has an idea how to get a rendered video in such a painful situation?
Regards,
Christian