Yes it happens, I think there are certain times of the day that I get attacked the most. Maybe it's the times where most people are awake/active in game. 

To be honest, I get the impression that the large majority of players just doesn't care about 3v3 arena. Personally, I usually do the 5 attacks a day required for the advanced quests, though not always, and I don't bother trying to maximize my wins with those 5 attacks. And looking at my Bronze III tier, most other players I see have ratings very close to 1000 - because they, too, are doing few if any attacks. 

The 3v3 arena do not regenerate coins so it will be way less active than the classic arena.

Also, like L9753, most people just do the required daily most likely due to not being able to assemble 3 or even 2 good teams.

However, I would try to use all the 3v3 arena coins, as my goal is not to beat all 3 teams in a battle, but to beat at least 1 team.  Each team you beat will get you 10 gold bars, which will add up since you have a total of 20 battles each day.

I have a bit different issue with Tag Team arena.

I changed my defense from real one to level 1s earlier today after the reset.

Last 2 defense battles in battle log show a win in 1 of 3 teams. In a spot where my most powerful team used to be. These battles happened after I put level 1s there.

I suppose something is wrong with defense update, and people still attack my defense that was there yesterday.

It may be the reason nobody attacks CHERUBIN31's defense as players still see a full defense instead of level 1s.

SunnyRay said:

I have a bit different issue with Tag Team arena.

I changed my defense from real one to level 1s earlier today after the reset.

Last 2 defense battles in battle log show a win in 1 of 3 teams. In a spot where my most powerful team used to be. These battles happened after I put level 1s there.

I suppose something is wrong with defense update, and people still attack my defense that was there yesterday.

It may be the reason nobody attacks CHERUBIN31's defense as players still see a full defense instead of level 1s.

I had a similar discussion on discord the other day - when you think about this, it makes perfect sense. When you refresh (or get a new slate of opponents in some other way), either in arena or tag team arena, you can keep the same list of opponents for quite a while - up to a week, I guess, if you aren't attacking, aren't refreshing and aren't changing tiers due to defensive battles. 

And so once you have that list of opponents... just imagine if the game allowed a defending team to be changed while it was on your opponent list. You prepare to hit one team but then once you actually hit, whoops, you're fighting an entirely different team? Doesn't happen, because once you have that list, the teams on it don't change anymore.