I am having the same issue with my Zoo game. Every since the last update, my game has been crashing almost none stop. As long as I play this game in PAUSE mode, it does not crash.. but within 30 secs of unpausing, it crashes. I play Planet Zoo thru Steam, as well as several other games, and none of them does what Planet Zoo is doing with the constant crashing. The hubby and I found out what the problem is, but it is something we can not fix on our end. The whole problem is, is when the game uploads to the Cloud anything you've done within your game, it is causing the crashes. It takes several several mins for the upload to finish, which in turn, overloads the transfer and the game crashes. I attempted to play my Zoo last night for ONE hour.. I logged in, immediately paused it, and started decorating it.. building some pens.. etc..etc.. doing things for the hour.. then saved what I had done, then un-paused it, and within 20 secs .. it crashed. So I quickly went to check the stats and info part of what your Planet Zoo game is doing.. and it was UPLOADING what I had saved with the one hour that I played. And thing is, is it took 8 MINUTES for it to complete that upload.
So hopefully Frontier will fix this problem with Planet Zoo so that we can play it.