we should revisit this moment in history.
Reagan's second term
It begins with these paragraphs
The president was acting strangely. In the wake of a scandal about his illegal dealings with foreign powers, White House aides felt he was so “inattentive and inept” that a memo sent to the chief of staff raised the prospect of invoking the 25th Amendment to remove him from office.
The president was Ronald Reagan, who was dealing with fallout from the Iran-Contra scandal. His chief of staff ultimately dismissed the possibility of using the 25th Amendment to remove him, but the incident is one of the few cases in American history in which White House staff seriously suggested it as an option for removing a president from office, based on his ability to perform the job.
And later in the article
The staff “told stories about how inattentive and inept the president was,” Cannon recalled to journalists Jane Mayer and Doyle McManus in Landslide: The Unmaking of the President, 1984-1988. “He was lazy; he wasn't interested in the job. They said he wouldn't read the papers they gave him—even short position papers and documents. They said he wouldn't come over to work—all he wanted to do was to watch movies and television at the residency."
History.com not being the most reliable source, I give you this reference.
New York Magazine