Comet C/2019 Y4 Atlas falls apart?

A comparison between pictures of Comet C/2019 Y4 (Altas) from March 26 and yesterday, April 10 shows clearly a difference in brightness at the coma sight. Normally it was expected the comet would get brighter. However the last week the comet is getting weaker. This is clearly seen at the pictures. The reason is not 100% clear but the comet could be broken apart.