I'd say it's a routine thing.Something is very wrong there. He's just lost bite. It's not the loss of a crowd it's much, much more than that. He looks unfit. He is not even shouting and screaming as he normally does. He just seems to be going through the motions. It's actually quite sad to watch. Rodgers has to address it one way or another.
Every player in the country had to suddenly stop just at the very point of the season when normally you'd be winding up for a big push if you were playing for a side that had things to go for (as we did) Then they've had to keep ticking over somehow while having no idea if or when they were coming back. Then they've had to play back to back games continually at the wrong time of year.
Some players will handle this better than others. I think Vardy is one who's handled it badly. Disruption to a normal rhythm can be damaging mentally as well as physically.
I'd say Vardy was a perfect candidate to be ****ed by it as he's both a) an aging player & b) has a game heavily reliant on pace. That's a perfect storm for producing a collapse I reckon.
Problem is, the only way it can be solved is for him to play his way out of it. Let's hope there's time.