Trouble with merge games

Almost every saturday- I start having trouble with the merge games- it takes almost 2-3 days to finally get them to load. On the Farm merge game I just get a lite blue screen and on merge acadamy I just get a white screen. Usually on Wednesday they both start working again- but in the meantime I cannot complete any challenges. It is just with the merge games. All other games let me play. What is going on????