How to remove a bug

Is there a download to remove a bug?  Everything I log in, after a few seconds, the game switches off, kicks me out and I have to restart again. Is there a fix please. This is so annoying.  Even the graphics aren’t fully loaded as some are missing. For example I can’t see the sun from the sunflowers. I tried to delete the app and download it again, but it’ s still the same issue. Please help. Thanks