Thanks for your answer Zhihong He, but I'm afraid that's not the problem. As far as memory is concerned, our server is kind of overdimensioned. We have 124gb of RAM and we're usually far from reaching 70% of memory usage.
How can I know which operations are being performed in the server right before the failure happens? Do you think System Monitor would give us a hint? I haven't seen anything relevant there...
Can this be somehow related to any object in my document?
No, there is no log to record the operations you have done to the dash. I mean do you remember any modification did you do to the dash or to the server?
According to my experience with QV, any time a error/warning happens that is because there is some modification/update in the dash or in the server.
Another test that you can try is to load less data in the dash, and see what will happen.
I will say SR2 is indeed a little bit old, so do not know whether this is any bug or not.
I do have experience that some version can not open my dash, for example, SR9, can open all my dashes except one, a little big one with 500M, and I just updated to later version when did not have this problem any more.