Sims 4 characters keep freezing

[JovianneJoie]

My Sims characters keep freezing and there's a delay in switching between characters.  They stay frozen for almost 2 minutes....is there a fix for this or is the game glitching for some reason?  Any weird thing that happens is the time still goes by, but the sims remain frozen in place.  Any help would be appreciated. Trying to complete a few challenges and it's very disruptive.  Thanks!