I think you can tell when a soap is in trouble when they have to re-write ( or in some cases write-in) history.
The most recent example is on AMC with the Zach/Bianca baby s/l. While Bianca was in the process of delivering her baby, we had to listen to her recite the details of Zach's trip to Paris 7 months ago so that we could all understand how it was possible for him to be her sperm donor. Likewise, on Y&R we had Katherine explaining that Victor had a secret vasectomy when everyone was scratching their heads about Sabrina's immaculate conception.
I understand that after years of stories not everything is going to fit into place, but these were major characters in major storylines and it feels like the situations were just shoved down our throats as a means to an end. Like they could skim over them and nobody would notice or care.