Gandalf is thriving again but.....

So My boy Gandalf is doing very well and we are so happy, but we have an issue we need some help with. He has a terrible habit of just constantly squawking. All morning long, at work with us, as soon as we get home, all evening until he goes down. He is feed fresh fruits and veggies daily, open feed on pellets, which he doesn't really eat, but sometimes he will munch on them, treats and snacks thought the day, plenty of toys, plenty of social interaction, many different perches in offices to climb on, we all talk to him and pick him up and I give him plenty of shoulder and hang out time 1 on 1. I am definitely his person , but even when I get him now all he does is squawk. Try playing and interacting, toys, feeding, treats, handling etc. Nothing works. He is healthy now and on his heart medication . His appetite is good, bowel movements good, motor skills, feathers and all are healthy. He has been to the vet several times and has a check up next Friday. Hopefully all is okay.

Does anyone think this is behavioral at this point? I know parrots make noise , but this is a lot, like all day, there are moments he will stop ,but it doesn't take much to get him going again. Reaching out here for any tips.