Friday was one of those nights for the Islanders — and they do happen over the course of 82 games — when every small bad habit a team has let slip into its game seems to bubble up and crescendo all at once.

It’s always ugly, always the sort of thing you can see coming in hindsight, and every so often, it’s either a harbinger or a necessity to jolt a team back into shape.

The Islanders, of course, will hope this was the latter. Time will tell.

For now, their performance in front of the home crowd in a 5-2 loss to the Wild might serve as a warning of sorts for an Islanders club that is now 6-6-2, an even NHL-.500. They need to tighten it up, they need to improve their details, and they need to start putting together 60-minute performances, otherwise this will not be a mere irregularity.

“I think they outworked us a lot tonight,” Bo Horvat said.

“I think we were clearly off from the get-go,” Anders Lee said.

“We seemed not to be able to win all those little battles to get the puck out,” Jean-Gabriel Pageau said.

“I just feel like tonight, they were the better team,” coach Patrick Roy said.

Yes, yes, yes and yes.

The Islanders’ game was pockmarked with disconnect. They did not seem to know where their teammates were or where the puck was, frequently getting caught offside or out of position. There were passes to no one, pucks fumbled off sticks, obvious breakdowns in communication, dump-ins that went for icing because the red line hadn’t been crossed.

The Islanders did briefly allow themselves some hope when Lee’s backhand feed up the ice sprung Pageau to make it 4-2 in the final minutes of the second period.

A spot of brilliance from Kirill Kaprizov put an end to that. The Russian winger went between his legs on a pass to Mats Zuccarello, then ripped in a one-timer for the 5-2 goal on Zuccarello’s feed back to him.

The Islanders’ failure on the night, though, was much more complete than such a moment implied.

The Alexander Romanov-Tony DeAngelo pair, a problem spot throughout the early portion of the season, had an especially brutal night, with Romanov on the ice for Minnesota’s first three goals and DeAngelo for their first two.

Asked about the pair that has been outscored 9-3 in its five-on-five minutes, Roy demurred.

“As a group, we didn’t have a great game, so I’m gonna leave it to this,” he said. “I got a lot of confidence in those guys, and I know it was probably not their best game. At the same time, I know how good they are and what they can do for this team.”

The top line of Emil Heineman, Bo Horvat and Mat Barzal did produce a goal when Horvat fed Heineman on one of few shifts where the Isles manufactured extended pressure but was otherwise barely noticeable. On the second line, Cal Ritchie struggled to impact proceedings and was demoted to the fourth line in the third.

The revamped three-center line with Ritchie, Casey Cizikas and Kyle MacLean did little in the final 20 minutes, as did the newly constructed three-wing line with Jonathan Drouin, Anthony Duclair and Kyle Palmieri. Roy, afterward, conceded that he had seen nothing of note from either, a tacit admission that if the lines change for Saturday’s game at the Rangers, it won’t be in that configuration.

Even Matthew Schaefer’s pair with Scott Mayfield was caught out for a goal after Schaefer’s feed on the rush ended up in Pageau’s skates and no forward covered for him, leaving Marco Rossi free on the rush to make it 4-1 after Kaprizov sprung him at 9:05 of the second.

The Islanders had cut the lead to 2-1 on Heineman’s goal at 4:38 of the same period, only for their momentum to evaporate barely over a minute later when Brock Faber’s snap shot went off the glove of David Rittich to re-extend Minnesota’s lead to 3-1.

“I feel like we shoot ourselves in the foot all the time on mistakes that we make as individuals,” Horvat said. “It ends up in the back of our net. Sometimes, we need to make the simple play.”

Might this be a wake-up call.

“I think we can use it as that,” he said.

They had better.