First let me say that I think that we ought to be able to scroll as much as we like and the game to seldom crash.
Second I wonder if it is connected somehow to your other post on " shortage of high value tiles!" and a great deal of scrolling in searching several kingdoms looking for them.
Yesterday I decided to see if I could find some leftover high value tiles in order to finish the next level of yielding.
I started at the top of the map scrolled to the bottom and in order to return to the top entered the start co-ordinates it immediately crashed, and each time I repeated the exercise for the next section, the same thing happened again, three times in all, so I gave up.
I surmised there were no such tiles left, and the searching and crashing was taking up too much time and for little gain.