Tonight, two actresses leave their sitcoms in the middle of long runs.

America Ferrara is exiting “Superstore” on NBC with a wrap up episode and an explanation. In real life, Ferrara has lots of opportunities. “Superstore” was an ensemble, and she’s a star after “Ugly Betty.” Her contract was probably up and producers didn’t want to pay more.

But the big exit tonight is unexplained and a mystery: Anna Faris is leaving “Mom” after seven seasons. There is no adequate explanation. The show was renewed last spring and she was part of it. She plays the “daughter” in a show called “Mom.” Now Allison Janney’s Mom has no child.

Faris exits without an ending episode. She didn’t come back for a big farewell special. She just didn’t come back to work after th summer. The tabloids question whether there’s an issue with bulimia or drinking. Faris has nothing booked and no publicly known prospects. We can only hope she’s ok and getting the help she needs for whatever is wrong.

Meantime, “Mom” is one of those strange shows that no one you know watches, gets no reviews or awards, it’s just there until it’s not. Funny that Emmy award and Oscar winner Janney wound up there and no one pats attention to it. She gets an annuity and checks for the rest of her life. But wait till she’s free to resume her real career!

UPDATE They explained the character’s absence by saying she went off to grad school. LOL. At Georgetown University Law. Quite a leap of fiction!

Here’s the weekly Why-is-ABC-killing-“The Conners” story.

The “Roseanne” spin off dropped below 4 million viewers on Wednesday night to 3.9 million. That’s a 4.8% decrease from last week and a 35% drop from the end of last season.

So what’s the deal? “The Conners” is now trapped on a weak night at a bad time. If this continues, they’ll be on the bubble to be cancelled. Maybe ABC is trying to get out of paying John Goodman, Laurie Metcalf, and Sara Gilbert. Who knows?

The only good news is that “The Conners” was the number 1 scripted show on network TV on Wednesday. It was beaten by a new competition music show called “I Can See Your Voice” on Fox, which has the benefit of picking up viewers from “The Masked Singer” hosted by anti-Semite Nick Cannon.

TMZ, the TV show and website, thrive on scandal. But the biggest scandal right now is that the trashy syndicated series has fallen out of favor with fans this season, and its website companion is in trouble, too.

We couldn’t stop TMZ at the airport or outside a restaurant to ask it these questions. Or give it the bad news.

But ratings last week for TMZ Live in syndication dropped 29% from the prior week, down to just 500,000 people tuning in to see some celebrity get ambushed. They were at 900,000 the week of October 6th. That’s a 40% drop.

At the same time, TMZ.com has dropped in its rankings by almost 200 points over the last 90 days according to alexa.com.

But the pandemic may be doing them in. Celebrities aren’t in airports anymore, and they’re not in restaurants. Video paparazzi can’t stalk them around West Hollywood as they once did, or lie in wait at LAX or JFK. So TMZ is just counting on a celebrity dropping dead or least being rushed to the hospital in greater Los Angeles, with EMS drivers getting cash under the table.

Probably no one wants a vaccine more than Harvey Levin. He needs everyone back outside in the wild! Meantime, a 40% fall in the ratings over 90 days is something that producers will have to deal with soon!