Thank you all for your responses.
@cmallonee you are right, the gateway is not crashing, I am just being disconnected, although to the end user it seems like it crashed(it takes a refresh to recover). The popup I would not call incredibly complicated. Basically it allows the user to set up custom filters for a data set, it includes a table a dropdown, and an embedded view(which in turn is very simple). However to set up some filters, the dataset is required, as the options are from the data itself, so the view has to access it in some way. To answer your question, it does the same even if I have the view running, in an embedded view. As soon as i increase the data set size, it disconnects the same way.
Apart from reducing the dataset size, what do you think the options are in this case? Should I increase the max message size(I suppose the limit is there for a reason?-also I dont know how to do that). Or should I just store the dataset in a session property and be done?(Either way it has to be stored somewhere).