Urgent Weird Lovebird behavior for years

[Csolis22]

My lovie is 8 years old and she’s exhibited these behaviors for almost 4 years now.
We have done every exam in the book- x-rays, blood work, crop swabs, gram stains.
Everything comes out clear.
She remains at a healthy weight, never loses any.
I’m at a loss, she goes through periods where she’s fluffed up, regurgitating and just sitting in her bowl all day. she no longer lays any eggs but she’s constantly rubbing herself on her toys.
I have attached videos of this odd behavior, what could it be?
They’ve given her many antibiotics, anti inflammatory, and it just doesn’t stop and her exam results are always clean.

The vet doesn’t even know when it could be anymore. I’ve gotten second opinions and taken her to multiple specialists who are convinced it’s caused by hormones.

The only thing that ever helps is switching her to a travel cage and when we play together. But the second she goes back in she starts with this behavior and I hate it because she looks like she’s sick.

Can anyone offer some advice?

Fluffed Up

Weird behavior video

 

[April]

@Zara Any ideas?

 

[Mizzely]

I have a bird that will spend 10 minutes or so several times a day during his peak hormonal periods just regurgitating onto his feet, toys, perches, etc. This is accompanied by rubbing himself on perches. So to me, it definitely seems hormonal.

 

[Csolis22]

I have a bird that will spend 10 minutes or so several times a day during his peak hormonal periods just regurgitating onto his feet, toys, perches, etc. This is accompanied by rubbing himself on perches. So to me, it definitely seems hormonal.

Thank you for this, it really helps my worry.
What about being puffed up? Does he puff up during these hormonal episodes as well? That’s what I catch her doing on her bowl or perch

 

[Mizzely]

Thank you for this, it really helps my worry.
What about being puffed up? Does he puff up during these hormonal episodes as well? That’s what I catch her doing on her bowl or perch

I mean, he puffs up when he is sleeping sometimes. All of my birds have at some point or another.

 

[Zara]

The first video is normal, sleeping fluffy like that. I have seen my birds sleeping like that before as singles and pairs.